Reusable filter system and framework, method of assembly and transport thereof, and use thereof

Abstract

In some embodiments, a reusable filter system for interchangeable pleated filters is provided, the reusable filter system comprising: (a) a reusable frame including a first retainer, a second retainer, a third retainer, and a fourth retainer; (b) at least one flexible sheet configured to be attached to at least a portion of an upper pleat top face and / or a lower pleat top face and extending outwardly from a first pleat edge and a second pleat edge; and (c) at least one plug, wherein the first retainer, the second retainer, the third retainer, and the fourth retainer are configured to reversibly connect to each other to form the reusable frame, and wherein each of the first retainer, the second retainer, the third retainer, and the fourth retainer further includes a plug receiving portion sized and shaped to receive the plug. Other exemplary embodiments are described herein. In some embodiments, the reusable filter system is user-friendly and environmentally friendly, and reduces transportation costs.

Description

[0001] Cross-references to related applications

[0002] This application claims priority and benefit to U.S. Provisional Application Serial No. 63 / 200,307, filed March 1, 2021. All contents of the foregoing application are hereby incorporated herein by reference in their entirety for all purposes. Technical Field

[0003] This application relates to air filter systems. More specifically, this application relates to reusable air filter systems. Background Technology

[0004] Some traditional air filter cartridges may include a filter element, a frame, and a metal grille. These filter cartridges are designed for single use and are environmentally unfriendly. The filter media is typically pleated to provide a large surface area for particle collection, but it is easily deformable due to the forces of air passing through the media. Furthermore, due to the shape of the pleated media, pleated filter cartridges occupy a significant amount of unused space in each filter, leading to high transportation costs. Additionally, the pleated filter material is soft and easily deformable (e.g., due to back pressure generated by large airflows), and any bypass airflow from the edges and sides of the pleated filter will affect filtration efficiency. Therefore, new filter systems and frames, as well as methods for their manufacture and transportation, are needed. Summary of the Invention

[0005] This article discloses novel frames and systems for air filtration, processes for preparing reusable frames and reusable filter systems, as well as their transport packaging methods and manufacturing methods.

[0006] In some embodiments, a reusable filter system is provided, the reusable filter system comprising: (a) an interchangeable filter material having a plurality of pleats, each pleat having a pleat height, a pleat width, and a cross section defining a pleat profile, the filter having a first pleated edge generally perpendicular to a pleating direction and an opposing second pleated edge defining a variable filter width, and a first side generally parallel to the pleating direction and an opposing second side defining a filter length; and (b) a reusable frame comprising: (i) a first retainer sized and shaped to cover and support each of the plurality of pleats along the first pleated edge; (ii) a second retainer sized and shaped to cover and support each of the plurality of pleats along the second pleated edge; and (iii) a first connector that is accessible along the first side... The filter is connected to the first and second retainers along the second side edge; and (iv) a second connector that can be connected to the first and second retainers along the second side edge; and (v) a third retainer whose size and shape are configured to support the plurality of pleats near a midpoint between the first and second pleated edges, the first and second connectors being further configured to connect to the third retainer at the midpoint, wherein, when the system is in a disassembled state, the filter is folded, and wherein each of the first and second connectors connects to the first and second retainers to form a cavity therein for receiving the filter, and when the system is in an assembled state, the first, second, and third retainers interact with the plurality of pleats to hold the spaced-apart pleated structure of the filter. In another embodiment, the first and second connectors are retractable, such that the frame can be unfolded to receive the filter and can be folded to minimize the size of the frame.

[0007] In some embodiments, a reusable filter system is provided, the reusable filter system comprising: (a) an interchangeable filter material having a plurality of pleats, each pleat having a pleat height, a pleat width, and a cross section defining a pleat profile, the filter having a first pleated edge generally perpendicular to the pleating direction and an opposing second pleated edge defining a variable filter width, and a first side generally parallel to the pleating direction and an opposing second side defining a filter length; and (b) a reusable frame comprising: (i) a first retainer sized and shaped to cover and support each of the plurality of pleats along the first pleated edge; (ii) a second retainer sized and shaped to cover and support each of the plurality of pleats along the second pleated edge; (iii) a first connector connectable to the first retainer and the second retainer along the first side; and (iv) a second... (v) A connector, the second connector being connectable to the first retainer and the second retainer along the second side; and (v) a third retainer, the third retainer being sized and shaped to support the plurality of pleats near a midpoint between the first pleated edge and the second pleated edge, the first connector and the second connector being further configured to connect to the third retainer at the midpoint, wherein the first retainer, the second retainer and the third retainer, and the first connector and the second connector are serrated shapes suitable for stacking on top of each other, and the filter is folded when the system is in a disassembled state, and wherein each of the first connector and the second connector is connected to the first retainer and the second retainer to form a cavity therein for receiving the filter, and the first retainer, the second retainer and the third retainer interact with the plurality of pleats when the system is in an assembled state to hold the spaced-apart pleated structure of the filter.

[0008] In some embodiments, a reusable filter system is provided, the reusable filter system comprising: (a) an interchangeable filter having a plurality of pleats, each pleat having a pleat height, a pleat width, and a cross section defining a pleat profile, the filter having a first pleated edge and an opposing second pleated edge generally perpendicular to the pleating direction, a first side edge and an opposing second side edge generally parallel to the pleating direction, and an upper pleat top surface and an opposing lower pleat top surface; and (b) a reusable frame comprising: (i) a first retainer, the first retainer being sized and shaped to retain the plurality of pleats along the first pleated edge; (ii) a second retainer, the second retainer being sized and shaped to retain the plurality of pleats along the second pleated edge; and (iii) a third retainer, the first... (iv) a third retainer sized and shaped to retain the plurality of pleats along the first side; and (v) a fourth retainer sized and shaped to retain the plurality of pleats along the second side; and (v) at least one pleat spacer connectable to the frame, wherein the first, second, third, and fourth retainers are configured to be reversibly connected to each other to form the reusable frame having cavities to receive the filter when the system is in the assembled state, and wherein each of the at least one pleat spacer includes a plurality of spacer elements sized and shaped to match the plurality of pleats to retain the spaced pleat profile of the filter when the system is in the assembled state.

[0009] In some embodiments, a reusable frame for an interchangeable pleated filter is provided, the filter having a plurality of pleats, each pleat having a pleat height, a pleat width, and a cross section defining a pleat profile, the filter having a first pleated edge and an opposing second pleated edge generally perpendicular to the pleating direction, a first side and an opposing second side generally parallel to the pleating direction, and an upper pleat top face and an opposing lower pleat top face, the filter further comprising at least one flexible sheet configured to attach to at least a portion of the upper pleat top face and / or the lower pleat top face and extend outwardly from the first pleated edge and the second pleated edge to form a first pleated edge extension and a second pleated edge extension, respectively, the reusable frame comprising: (i) a first retainer, the first retainer being sized and shaped to retain the plurality of pleats along the first pleated edge; (ii) a second retainer, the second retainer being sized and shaped to retain the plurality of pleats along the first pleated edge; (iii) a retainer, the third retainer being sized and shaped to retain the plurality of folds along the first side; (iv) a fourth retainer, the fourth retainer being sized and shaped to retain the plurality of folds along the second side; and (v) at least one fold spacer, the at least one fold spacer being connectable to the frame, wherein the first retainer, the second retainer, the third retainer and the fourth retainer are configured to be reversibly connected to each other to form the reusable frame having cavities to receive the filter when the system is in the assembled state, and wherein each of the at least one fold spacer includes a plurality of spacer elements, the spacer elements being sized and shaped to match the plurality of folds, thereby maintaining the spaced fold profile of the filter when the system is in the assembled state.

[0010] In some embodiments, a method is provided for assembling a reusable filter system for interchangeable pleated filters, the method comprising the steps of: (a) providing the aforementioned reusable filter system, the reusable filter system including a reusable frame; (b) partially or fully assembling the reusable frame by connecting a first retainer, a second retainer, a third retainer, and a fourth retainer together and mounting at least one pleated spacer to the reusable frame; (c) mounting the interchangeable pleated filter to the reusable frame; (d) if the reusable frame is partially assembled, fully assembling the reusable frame; and (e) mounting the at least one plug into a plug receiving portion of the reusable frame.

[0011] In some embodiments, a method for transporting a reusable filter system is provided, the method comprising the steps of: (a) providing the aforementioned reusable filter system in a disassembled state; (b) packaging the interchangeable pleated filter in a folded state and / or the reusable filter system in a disassembled state into one or more packaging containers to form at least one finished package, thereby significantly reducing the space volume of the finished package; (c) delivering the finished package to a location for use; and (d) assembling the reusable filter system for use.

[0012] In some embodiments, the use of a reusable filter system according to any one of the embodiments described herein in an air filtration system is provided. In some embodiments, an air filtration method using a reusable filter system as described in any one of the embodiments described herein is provided, the method comprising the step of applying the reusable filter system to an air filtration system.

[0013] This invention offers numerous advantages. In some embodiments, at least certain components of the filter system (such as the frame of the novel filter system) and the frame itself are reusable for extended periods, thus being more environmentally friendly. In some embodiments, the novel system can be easily adapted to any air filtration system, such as air conditioning and mechanical ventilation (ACMV) systems, AHU / PAUs, central MVAC systems, and / or VRV / split systems. In some embodiments, the novel system is scalable and can be adapted to different sizes. In some embodiments, the novel system provides robust mechanical protection for the filter media. In some embodiments, the novel system maintains the pleated structure or geometry of the filter media, thereby providing a larger surface area for particle collection. In some embodiments, the novel system provides reversible connection designs (such as slot-type, snap-on, or interlocking) for easy filter replacement or installation. In some embodiments, because the spaced pleats of the filter are maintained, the novel system provides better filtration efficiency while maintaining a low pressure drop. In some embodiments, the novel system maximizes surface area within a fixed frame size. In some embodiments, the novel system in its disassembled state provides a seamless pleated enclosure, significantly reducing volume and thus lowering transportation costs. In some embodiments, the novel frame is easy to assemble and disassemble, facilitating filter replacement. In some embodiments, the reusable frame and system are universal and can be adapted to various sizes and applications. In some embodiments, at least some components of the reusable frame and system (such as retainers and pleat spacers) are foldable, retractable, or can be disassembled and packaged in a compact package, which facilitates packaging, transportation, and / or storage. In some embodiments, the system and frame are user-friendly and easy to assemble or disassemble. In some embodiments, the provided reusable system and frame provide good mechanical support for the filter. In some embodiments, various features of the reusable system and frame ensure good retention or fixation of the edges and sides of the pleated filter, preventing air from bypassing or leaking directly from the edges or sides. In some embodiments, various features of the reusable system and frame provide good support for the filter to withstand back pressure and prevent deformation, especially for applications requiring high airflow rates, such as, but not limited to, AHU systems. In some embodiments, various features of the reusable system and frame adjust or maintain the pleat spacing to maximize filtration efficiency. Attached Figure Description

[0014] Figures 1A to 1F This is a schematic diagram illustrating a reusable filter system of an example embodiment, wherein... Figures 1A to 1C A reusable system (with filter material) is shown, and Figures 1D to 1F A reusable frame without filter material is shown.

[0015] Figures 2A to 2BThis is a schematic diagram illustrating a reusable filter system of another example embodiment.

[0016] Figures 3A to 3B This is a schematic diagram illustrating the steps of packaging a filter system in a method for transporting a filter system in an example embodiment.

[0017] Figures 4A to 4B This is a schematic diagram illustrating the steps of packaging filter material in a method of transporting a filter system according to another example embodiment.

[0018] Figures 5A to 5B This is a schematic diagram illustrating the steps of packaging filter material in a method of transporting a filter system according to another example embodiment.

[0019] Figures 6A to 6B This is a schematic diagram illustrating the steps of packaging filter material in a method of transporting a filter system according to another example embodiment.

[0020] Figures 7A to 7B This is a schematic diagram illustrating a reusable filter system of an example embodiment.

[0021] Figure 7C It shows the basis Figure 7A A schematic diagram of the reusable framework of the reusable filter system of the same example embodiment.

[0022] Figure 7D It demonstrates the basis and Figure 7A A schematic diagram of the connection between two retainers via a frame connector in a reusable filter system of the same example embodiment shown.

[0023] Figure 7E It is based on and Figure 7A A cross-sectional view of the first retainer of the same example embodiment shown.

[0024] Figure 7F It is based on and Figure 7A A cross-sectional view of the third retainer of the same example embodiment shown.

[0025] Figure 7G It demonstrates the system's state during assembly, based on... Figure 7A A schematic diagram of the interaction between the pleated spacer, the filter, and the third retainer in a reusable filter system of the same example embodiment shown.

[0026] Figure 8 This is a schematic diagram illustrating the interaction between the pleated spacer, the filter, and the third retainer in a reusable filter system according to another example embodiment when the system is in an assembled state.

[0027] Figure 9AThis is a schematic diagram illustrating a reusable filter system of another example embodiment.

[0028] Figure 9B It demonstrates the basis and Figure 9A A schematic diagram of the connection between two retainers via a frame connector in a reusable filter system of the same example embodiment shown.

[0029] Figure 9C It is based on and Figure 9A A cross-sectional view of the first retainer of the same example embodiment shown.

[0030] Figure 9D It is based on and Figure 9A A cross-sectional view of the third retainer of the same example embodiment shown.

[0031] Figures 10A to 10D This is a schematic diagram illustrating a reusable filter system of an example embodiment.

[0032] Figures 10E to 10F This is a schematic diagram showing a foldable support member in both a folded and unfolded state, wherein the foldable support member is based on... Figure 10A The first and second connectors of the reusable filter system of the same example embodiment shown are connected.

[0033] Figure 10G It shows the basis with Figure 10A A close-up exploded view of the flexible cover and filter of the reusable filter system of the same example embodiment shown.

[0034] Figure 10H It shows the basis with Figure 10A A close-up perspective view of the spline of a reusable filter system of the same example embodiment shown.

[0035] Figure 10I It demonstrates the basis and Figure 10A A schematic cross-sectional view of the interaction between the plug, third retainer, and filter along the first side of the filter in the same example embodiment shown.

[0036] Figure 10J It demonstrates the basis and Figure 10A A schematic cross-sectional view of the interaction between the plug, second retainer, flexible cap, and filter along the second pleated edge of the filter in the same example embodiment shown.

[0037] Figure 10K It demonstrates the basis and Figure 10A A schematic diagram of the connection between the second and fourth retainers via a frame connector in a reusable filter system of the same example embodiment shown.

[0038] Figures 11A to 11C This is a schematic diagram illustrating a reusable filter system of an example embodiment.

[0039] Figures 11D to 11E It demonstrates the basis and Figure 11A A schematic diagram of the support and fourth retainer in the same example embodiment shown, when the support and fourth retainer in the reusable filter system are separated from and connected to each other.

[0040] Figures 12A to 12B This is a schematic diagram illustrating a reusable filter system of an example embodiment.

[0041] Figure 12C It shows the basis with Figure 12A Close-up view of the flexible sheet and filter of the reusable filter system of the same example embodiment shown.

[0042] Figure 12D It shows the basis with Figure 10A A close-up view of the stopper strip of a reusable filter system of the same example embodiment shown.

[0043] Figure 12E It demonstrates the basis and Figure 12A A schematic diagram of the interaction between the plug, third retainer, and filter along the first side of the filter in the same example embodiment shown.

[0044] Figure 12F It demonstrates the basis and Figure 12A A schematic cross-sectional view of the interaction between the plug, second retainer, flexible sheet and filter along the first pleated edge of the filter in the same example embodiment shown.

[0045] Figures 13A to 13B This is a schematic diagram illustrating a reusable filter system of an example embodiment.

[0046] Figure 13C It is based on and Figure 13A A cross-sectional view of the second retainer in a reusable filter system of the same example embodiment shown.

[0047] Figure 14A A method for assembling a filter system and a reusable framework according to an example embodiment is shown.

[0048] Figure 14B A method for assembling a filter system and a reusable framework according to another example embodiment is shown.

[0049] Figure 15 A transport packaging method for a reusable filter system according to an example embodiment is shown.

[0050] Figure 16 This is a schematic diagram illustrating the steps of packaging the filter system in a method for transporting a filter system in an example embodiment.

[0051] Figure 17A and Figure 17B This is a schematic diagram illustrating the steps of packaging the filter system in a method for transporting a filter system in an example embodiment. Detailed Implementation

[0052] As used herein and in the claims, “comprising” and “including” mean to include the following elements, but do not exclude other elements.

[0053] As used herein and in the claims, the terms “comprising” (or any related form, such as “comprise” and “comprises”), “including” (or any related form, such as “include” or “inludes”), “containing” (or any related form, such as “contain” or “contains”), or “having” (or any related form, such as “have” or “has”) mean to include the following elements, but do not exclude other elements. It should be understood that, for each embodiment in which the terms "comprising" (or any related form, such as "comprise" and "comprises"), "including" (or any related form, such as "include" or "includes"), or "containing" (or any related form, such as "contain" or "contains"), this disclosure / application also includes alternative embodiments in which the terms "comprising," "including," "containing," or "having" are replaced with "substantially consisting of" or "consisting of." These alternative embodiments using "consisting of" or "substantially consisting of" are to be understood as narrower embodiments of the "comprising," "including," or "containing" embodiments.

[0054] For example, alternative embodiments of "a solution containing A, B, and C" are "a solution composed of A, B, and C" and "a solution composed substantially of A, B, and C". This disclosure / application includes these embodiments even if the latter two are not explicitly stated. Furthermore, it should be understood that the scope of the three embodiments listed above is different.

[0055] For clarity, “comprising,” “including,” and “containing,” as well as any related forms, are open-ended terms that allow for additional elements or features beyond the specified essential elements, while “consisting of” is a closed-ended term that is limited to the elements listed in the claims and excludes any elements, steps, or ingredients not specified in the claims.

[0056] The phrase "consisting essentially of..." limits the scope of the claim to specific materials, components, or steps ("basic elements") that do not substantially affect the essential features(s) of the claimed invention. In some embodiments, the essential features are the basic and novel features(s) of the claimed invention(s).

[0057] As used herein, the singular forms “a,” “an,” and “the” are also intended to include the plural forms unless the context explicitly indicates otherwise. When a range is referred to in the specification, the range should be understood to include each discrete point within the range. For example, 1-7 means 1, 2, 3, 4, 5, 6, and 7.

[0058] As used herein, the term “about” is understood to mean within the normal tolerance range in the field and not exceeding ±10% of the specified value. For example only, about 50 means all values ​​from 45 to 55, inclusive. As used herein, the phrase “about” also includes the specific value; for example, about 50 includes 50.

[0059] As used herein and in the claims, "filter" means a fibrous material, medium, device, or element that removes particulate matter or contaminants (such as dust, pollen, mold, and bacteria) from the air. In some embodiments, the filter may be reusable (e.g., after cleaning and / or disinfection). In other embodiments, the filter may be disposable.

[0060] As used herein and in the claims, "pleat" means a repeating structure.

[0061] As used herein and in the claims, a "pleated filter" refers to a filter material that is repeated multiple times, such as by folding or by combining multiple repeating units together. In some examples, the folds are formed in a zigzag pattern to create multiple pleats. In some examples, a "pleated filter" also includes a bag filter formed by a series of multiple small bag-like filters. In some examples, a "pleated filter" is a reversibly foldable and deployable air filter element.

[0062] As used herein and in the claims, “flexible” means deformable or able to be bent.

[0063] As used herein and in the claims, "rigid" means lacking flexibility or being difficult for a user to deform or bend during normal use. The degree of rigidity may vary, as long as it does not affect the overall function of the frame or system.

[0064] As used herein and in the claims, “frame” means a structure that provides support. In some examples, a frame is a closed structure having an overall rectangular shape.

[0065] As used herein and in the claims, "plug" refers to an elongated, flexible rope. In some embodiments, the plug may be manufactured by an extrusion process.

[0066] As used herein and in the claims, “interlockable” means capable of interlocking.

[0067] As used herein and in the claims, “attach,” “attached,” and “attaching” refer to a direct or indirect physical combination or connection with other elements.

[0068] As used herein and in the claims, “connect,” “connected,” and “connecting” mean a direct or indirect combination or link with other elements.

[0069] As used herein and in the claims, "secure" and "securing" mean to hold firmly.

[0070] For convenience and clarity, spatial terms such as “vertical,” “horizontal,” “up,” “down,” “left,” and “right” may be used herein with reference to the accompanying drawings. However, systems and frames can be used in many orientations and locations, and these terms are not intended to be restrictive and / or absolute.

[0071] As used herein and in the claims, the terms “first,” “second,” “third,” “fourth,” etc., may be used to describe various limitations, elements, components, regions, layers, and / or sections, but these limitations, elements, components, regions, layers, and / or sections should not be limited by these terms. These terms are used only to distinguish one limitation, element, component, region, layer, or section from another limitation, element, component, region, layer, or section. Therefore, without departing from the teachings of this application, the first limitation, element, component, region, layer, or section discussed below may be referred to as a second limitation, element, component, region, layer, or section.

[0072] As used herein and in the claims, “inner” or “interior” will refer to the direction toward the center of an object (e.g., a filter), and the term “outer” or “exterior” will refer to the direction opposite to the center.

[0073] For ease of description, all subsequent figures with the same reference numerals refer to the same parts and will not be repeated in the description of each figure.

[0074] Numbered Examples

[0075] Group 1

[0076] 1. A reusable filter system, comprising:

[0077] (a) An interchangeable filter material having a plurality of pleats, each pleat having a pleat height, a pleat width, and a cross-section defining a pleat profile, the filter having a first pleated edge and an opposing second pleated edge generally perpendicular to the pleating direction, and a first side and an opposing second side generally parallel to the pleating direction; and

[0078] (b) A reusable framework, said reusable framework comprising:

[0079] (i) A first retainer, the size and shape of which are configured to cover and support each of the plurality of pleats along the first pleated edge;

[0080] (ii) A second retainer, the size and shape of which are configured to cover and support each of the plurality of pleats along the edge of the second pleat;

[0081] (iii) A first connecting member, which is connectable along the first side to the first retainer and the second retainer; and

[0082] (iv) A second connector, which is connectable along the second side to the first retainer and the second retainer; and

[0083] (v) A third retainer, the third retainer being sized and shaped to support the plurality of pleats near a midpoint between the first pleated edge and the second pleated edge, the first connector and the second connector being further configured to connect to the third retainer at the midpoint.

[0084] The first retainer, the second retainer, and the third retainer, as well as the first connector and the second connector, are serrated shapes suitable for stacking on top of each other, and the filter is folded when the system is in a disassembled state.

[0085] Each of the first and second connectors is connected to the first, second, and third retainers to form a cavity therein for receiving the filter, and when the system is in an assembled state, the first and second retainers interact with the plurality of pleats to hold the spaced-apart pleated structure of the filter.

[0086] 2. A reusable filter system, comprising:

[0087] (a) An interchangeable filter material having a plurality of pleats, each pleat having a pleat height, a pleat width, and a cross-section defining a pleat profile, the filter having a first pleated edge and an opposing second pleated edge generally perpendicular to the pleating direction, and a first side and an opposing second side generally parallel to the pleating direction; and

[0088] (b) A reusable framework, said reusable framework comprising:

[0089] (i) A first retainer, the size and shape of which are configured to cover and support each of the plurality of pleats along the first pleated edge;

[0090] (ii) A second retainer, the size and shape of which are configured to cover and support each of the plurality of pleats along the edge of the second pleat;

[0091] (iii) A first connecting member, which is connectable along the first side to the first retainer and the second retainer; and

[0092] (iv) A second connector, which is connectable along the second side to the first retainer and the second retainer; and

[0093] (v) A third retainer, the third retainer being sized and shaped to support the plurality of pleats near a midpoint between the first pleated edge and the second pleated edge, the first connector and the second connector being further configured to connect to the third retainer at the midpoint.

[0094] The shapes of the first retainer, the second retainer, the third retainer, the first connector, and the second connector are adapted to be staggered, and the filter is folded when the system is in a disassembled state.

[0095] Each of the first connector and the second connector is connected to the first retainer and the second retainer to form a cavity therein for receiving the filter, and when the system is in an assembled state, the first retainer and the second retainer interact with the plurality of pleats to hold the spaced-apart pleated structure of the filter.

[0096] 3. A method for preparing a filter system, the method comprising the following steps:

[0097] (a) A filter material comprising a plurality of pleats, each pleat having a pleat height, a pleat width and a cross section defining a pleat profile, the filter having a first pleated edge generally perpendicular to the pleating direction and an opposing second pleated edge defining a variable filter width, and a first side generally parallel to the pleating direction and an opposing second side defining a filter length.

[0098] (b) A reusable frame is provided, the frame comprising: a first retainer sized and shaped to cover and support each of the plurality of pleats along a first pleated edge; a second retainer sized and shaped to cover and support each of the plurality of pleats along a second pleated edge; a first connector connectable to the first retainer and the second retainer along a first side; and a second connector connectable to the first retainer and the second retainer along a second side.

[0099] (c) When the system is in a disassembled state, the filter is packaged in a folded form, and the retainer and frame are packaged in a staggered or stacked arrangement, and

[0100] When the system is in the assembled state, the filter and the frame formed by the retainer and connector are assembled such that the first retainer and the second retainer interact with the plurality of pleats to hold the spaced-apart pleated structure of the filter.

[0101] 4. A method for a transport filter system, the method comprising the following steps:

[0102] (a) Providing a filter system as described in Example 1 or Example 2 in a disassembled state;

[0103] (b) Packing folded filter material and / or compact retainers and connectors into a combined packaging container or individual packaging containers to form a finished package.

[0104] This results in a significant reduction in the spatial volume of the finished packaging;

[0105] (c) Deliver the finished package to the location where it is to be used;

[0106] (d) Assemble the filter and the frame into a filter system for use.

[0107] Group 2

[0108] 1. A reusable filter system for interchangeable pleated filters, the interchangeable filters having a plurality of pleats, each pleat having a pleat height, a pleat width, and a cross-section defining a pleat profile, the filters having a first pleated edge and an opposing second pleated edge generally perpendicular to the pleating direction, a first side and an opposing second side generally parallel to the pleating direction, and an upper pleated top surface and an opposing lower pleated top surface, the filter system comprising:

[0109] (a) A reusable framework, said reusable framework comprising:

[0110] (i) A first retainer, the size and shape of which are configured to retain the plurality of pleats along the first pleated edge;

[0111] (ii) A second retainer, the size and shape of which are configured to retain the plurality of pleats along the second pleated edge;

[0112] (iii) a third retainer, the third retainer being sized and shaped to retain the plurality of pleats along the first side; and

[0113] (iv) A fourth retainer, the fourth retainer being sized and shaped to retain the plurality of folds along the second side;

[0114] (b) At least one flexible sheet, said flexible sheet being configured to be attached to at least a portion of the upper top surface of the fold and / or the lower top surface of the fold and extending outwardly from the first fold edge and the second fold edge to form a first fold edge extension and a second fold edge extension, respectively; and

[0115] (c) At least one stopper,

[0116] The first, second, third, and fourth retainers are configured to be reversibly connected to each other to form the reusable frame, which has a cavity to receive the filter when the system is in an assembled state.

[0117] Each of the first retainer, the second retainer, the third retainer, and the fourth retainer further includes a plug receiving portion, the plug receiving portion being sized and shaped to receive the plug, such that when the at least one plug is installed in the plug receiving portion, the plug receiving portion of each of the first retainer, the second retainer, the third retainer, and the fourth retainer is respectively able to frictionally secure the first pleated edge extension, the second pleated edge extension, the first side, and the second side within the plug receiving portion.

[0118] 2. The reusable filter system as described in Example 1, wherein the at least one flexible sheet is at least partially permeable to air.

[0119] 3. A reusable filter system as described in Example 1 or 2, wherein the at least one flexible sheet is fixedly attached to the filter by adhesive, thermal bonding and / or ultrasonic welding.

[0120] 4. The reusable filter system as described in Embodiment 1 or 2, wherein the at least one flexible sheet is a continuous sheet, the size and shape of which are configured to cover the entire upper top surface of the fold or the entire lower top surface of the fold and extend outward from the first fold edge and the second fold edge.

[0121] 5. The reusable filter system as described in any of the foregoing embodiments, wherein the at least one flexible sheet comprises a first flexible sheet and a second flexible sheet, the first flexible sheet being sized and shaped to cover the entire upper top surface of the fold or the entire lower top surface of the fold and extending outward from the first fold edge, and the second flexible sheet being sized and shaped to cover the entire upper top surface of the fold or the entire lower top surface of the fold and extending outward from the second fold edge.

[0122] 6. A reusable filter system as described in any of the foregoing embodiments, wherein, when the system is in the assembled state, all the plug receiving portions together form a continuous plug channel for receiving the plugs.

[0123] 7. The reusable filter system as described in any of the foregoing embodiments, wherein each strip receiving portion further includes at least one ridge to frictionally confine the strip within the strip receiving portion.

[0124] 8. The reusable filter system as described in any of the foregoing embodiments, wherein the plug strip further includes plug strip flaps extending along the longitudinal length of the plug strip to confine the first pleated edge, the second pleated edge, the first side and / or the second side within the frame when the system is in the assembled state.

[0125] 9. The reusable filter system as described in Example 8, wherein the plug further includes a neck portion that connects the plug and the plug flap.

[0126] 10. The reusable filter system as described in Example 9, wherein the neck portion further includes at least one recess, and the plug receiving portion further includes at least one ridge, the size and shape of which are configured to match the corresponding recess to confine the plug within the plug receiving portion.

[0127] 11. The reusable filter system as described in any of the foregoing embodiments further includes at least one pleated spacer connectable to the frame, wherein each of the at least one pleated spacer includes a plurality of spacer elements whose size and shape are configured to match the plurality of pleats, thereby maintaining the spaced pleat profile of the filter when the system is in the assembled state.

[0128] 12. The reusable filter system as described in Example 11, wherein the number of spacer elements generally matches the number of pleats, and each spacer element has a spacer element width generally matching the width of the pleats.

[0129] 13. A reusable filter system as described in Embodiment 11 or 12, wherein the at least one pleated spacer is provided in the form of a spring connectable to the third and fourth retainers, and the plurality of spacer elements are provided in the form of a plurality of coils, each coil being sized and shaped to match the pleat width.

[0130] 14. A reusable filter system as described in Embodiment 11 or 12, wherein the at least one pleated spacer is provided in the form of a serrated element that generally follows at least a portion of the pleated profile.

[0131] 15. The reusable filter system as described in Example 1, wherein,

[0132] The first retainer includes a pair of first clamping members, each having an engagement surface that is complementary to each other, the shape of the engagement surfaces generally matching the fold profile along the first folded edge; and

[0133] The second retainer includes a pair of second clamping members, each having an engagement surface that is complementary to each other, the shape of which generally matches the fold profile along the second folded edge.

[0134] Such that when the system is in the assembled state, the filter is clamped between the first clamp and the second clamp along at least a portion of the first pleated edge and the second pleated edge.

[0135] 16. The reusable filter system as described in Example 1, wherein,

[0136] The first retainer includes a first plate and a plurality of spaced-apart first teeth extending vertically from the longitudinal side of the first plate; and / or

[0137] The second retainer includes a second plate and a plurality of spaced-apart second teeth extending vertically from the longitudinal side of the second plate.

[0138] The spacing between two adjacent first teeth and / or second teeth is configured to match the corresponding fold width, and the tooth height is configured to match the corresponding fold height, thereby maintaining a spaced fold profile along the first side and / or the second side.

[0139] 17. A reusable filter system as described in any one of Examples 11 to 14, wherein the pleated spacer includes a spacer plate and a plurality of spacer teeth extending perpendicularly from the longitudinal side of the spacer plate, wherein the spacing between two adjacent spacer teeth is configured to match the corresponding pleat width, and the tooth height is configured to match the corresponding pleat height.

[0140] 18. A reusable filter system as described in any one of Examples 11 to 14, wherein the at least one pleated spacer is configured to be connected to the third retainer and the fourth retainer.

[0141] 19. The reusable filter system as described in any of the foregoing embodiments, wherein the reusable frame further includes a plurality of connectors, each connector being configured to reversibly connect the two ends of any two of the first retainer, the second retainer, the third retainer, and the fourth retainer together.

[0142] 20. The reusable filter system as described in any of the foregoing embodiments further includes at least one support member connected to the frame.

[0143] 21. The reusable filter system as described in Example 20, wherein the at least one support is configured to connect between the third retainer and the fourth retainer.

[0144] 22. A reusable filter system as described in Example 20 or 21, wherein the at least one support member is a rigid rod comprising a rectangular, slotted, or trapezoidal cross section.

[0145] 23. A reusable filter system as described in any one of Examples 20 to 22, wherein the at least one support member is a pair or more pairs of cross members pivotally connected to each other in one direction, each pair of cross members being pivotally connected at a central connection point, wherein the pair or more pairs of cross members are configured to connect the third retainer and the fourth retainer such that the third retainer and the fourth retainer can be switched between an assembled position and a disassembled position.

[0146] 24. A reusable frame for an interchangeable pleated filter, the filter having a plurality of pleats, each pleat having a pleat height, a pleat width, and a cross section defining a pleat profile, the filter having a first pleated edge and an opposing second pleated edge generally perpendicular to the pleating direction, a first side and an opposing second side generally parallel to the pleating direction, and an upper pleated top face and an opposing lower pleated top face, the filter further comprising at least one flexible sheet configured to be attached to at least a portion of the upper pleated top face and / or the lower pleated top face and extending outwardly from the first pleated edge and the second pleated edge to form a first pleated edge extension and a second pleated edge extension, the reusable frame comprising:

[0147] (i) A first retainer, the size and shape of which are configured to retain the plurality of pleats along the first pleated edge;

[0148] (ii) A second retainer, the size and shape of which are configured to retain the plurality of pleats along the second pleated edge;

[0149] (iii) a third retainer, the third retainer being sized and shaped to retain the plurality of pleats along the first side; and

[0150] (iv) A fourth retainer, the size and shape of which are configured to retain the plurality of pleats along the second side.

[0151] The first, second, third, and fourth retainers are configured to be reversibly connected to each other to form the reusable frame, which has a cavity to receive the filter when the system is in the assembled state.

[0152] Each of the first retainer, the second retainer, the third retainer, and the fourth retainer further includes a plug receiving portion, the plug receiving portion being sized and shaped to receive a plug such that when the at least one plug is installed in the plug receiving portion, the plug receiving portion of each of the first retainer, the second retainer, the third retainer, and the fourth retainer is respectively able to frictionally secure the first pleated edge extension, the second pleated edge extension, the first side, and the second side within the plug receiving portion.

[0153] 25. The reusable frame as described in Example 24, wherein, when the system is in the assembled state, all the plug receiving portions together form a continuous plug channel for receiving plugs.

[0154] 26. A reusable frame as described in Embodiment 24 or 25, wherein each plug receiving portion further includes at least one ridge to frictionally restrain the plug within the plug receiving portion.

[0155] 27. A reusable frame as described in any one of embodiments 24 to 26, wherein the plug receiving portion further includes at least one ridge, the size and shape of which are configured to match at least one recess of the plug to confine the plug within the plug receiving portion.

[0156] 28. The reusable frame as described in any one of Embodiments 24 to 27 further includes at least one pleated spacer connectable to the frame, wherein each of the at least one pleated spacer includes a plurality of spacer elements whose size and shape are configured to match the plurality of pleats, thereby maintaining the spaced pleat profile of the filter when the system is in an assembled state.

[0157] 29. A reusable frame as described in Example 28, wherein the number of spacer elements generally matches the number of pleats, and each spacer element has a spacer element width generally matching the width of the pleats.

[0158] 30. A reusable frame as described in Embodiment 28 or 29, wherein the at least one pleated spacer is provided in the form of a spring connectable to the third and fourth retainers, and the plurality of spacer elements are provided in the form of a plurality of spring coils, each spring coil being sized and shaped to match the pleat width.

[0159] 31. A reusable frame as described in Embodiment 28 or 29, wherein the at least one pleated spacer is provided in the form of a serrated member that generally follows at least a portion of the pleated profile.

[0160] 32. The reusable frame as described in Example 24, wherein,

[0161] The first retainer includes a pair of first clamping members, each having an engagement surface that is complementary to each other, the shape of the engagement surfaces generally matching the fold profile along the first folded edge; and

[0162] The second retainer includes a pair of second clamping members, each having an engagement surface that is complementary to each other, the shape of which generally matches the fold profile along the second folded edge.

[0163] Such that when the system is in the assembled state, the filter is clamped between the first clamp and the second clamp along at least a portion of the first pleated edge and the second pleated edge.

[0164] 33. The reusable frame as described in Example 24, wherein,

[0165] The first retainer includes a first plate and a plurality of spaced-apart first teeth extending vertically from the longitudinal side of the first plate; and / or

[0166] The second retainer includes a second plate and a plurality of spaced-apart second teeth extending vertically from the longitudinal side of the second plate.

[0167] The spacing between two adjacent first teeth and / or second teeth is configured to match the corresponding fold width, and the tooth height is configured to match the corresponding fold height, thereby maintaining a spaced fold profile along the first side and / or the second side.

[0168] 34. A reusable frame as described in any one of embodiments 28 to 31, wherein the pleated spacer includes a spacer plate and a plurality of spacer teeth extending perpendicularly from the longitudinal side of the spacer plate, wherein the spacing between two adjacent spacer teeth is configured to match the corresponding pleat width, and the tooth height is configured to match the corresponding pleat height.

[0169] 35. A reusable frame as described in any one of embodiments 28 to 31, wherein the at least one pleated spacer is configured to be connected to the third retainer and the fourth retainer.

[0170] 36. The reusable frame as described in any one of embodiments 24 to 35, wherein the reusable frame further comprises a plurality of connectors, each connector being configured to reversibly connect the two ends of any two of the first retainer, the second retainer, the third retainer, and the fourth retainer together.

[0171] 37. The reusable frame as described in any of the foregoing embodiments further includes at least one support member connected to the frame.

[0172] 38. The reusable frame as described in Example 37, wherein the at least one support is configured to connect between the third retainer and the fourth retainer.

[0173] 39. A reusable frame as described in Embodiment 37 or 38, wherein the at least one support member is a rigid rib having a rectangular, trapezoidal, or channel-shaped cross section.

[0174] 40. A reusable filter system as described in any one of Examples 37 to 39, wherein the at least one support member is a pair or more pairs of cross members pivotally connected to each other in one direction, each pair of cross members being pivotally connected at a central connection point, wherein the pair or more pairs of cross members are configured to connect the third retainer and the fourth retainer such that the third retainer and the fourth retainer can switch between an assembled position and a disassembled position.

[0175] 41. A method of assembling a reusable filter system for interchangeable pleated filters, the method comprising the steps of:

[0176] (a) Provide a reusable filter system as described in any one of Examples 1 to 23, the reusable filter system comprising a reusable frame, at least one flexible sheet and at least one plug strip;

[0177] (b) The reusable frame is partially or completely assembled by connecting the first retainer, the second retainer, the third retainer and / or the fourth retainer together and attaching at least one flexible sheet to the interchangeable pleated filter.

[0178] (c) Install the interchangeable pleated filter into the reusable frame;

[0179] (d) If the reusable frame is partially assembled, then assemble the reusable frame completely; and (e) install the at least one plug into the plug receiving portion of the reusable frame.

[0180] 42. The method as described in Example 41 includes the following steps:

[0181] At least one pleated spacer is installed onto the reusable frame.

[0182] 43. The method as described in Example 41, wherein step (b) further comprises:

[0183] The first retainer, the second retainer, the third retainer, and the fourth retainer are connected by multiple connectors.

[0184] 44. The method as described in Example 41 includes the following steps:

[0185] At least one support member is installed onto the reusable frame.

[0186] 45. A method for transporting a reusable filter system, the method comprising the steps of:

[0187] (a) Providing a reusable filter system as described in any one of Examples 1 to 23 in a disassembled state;

[0188] (b) Packing interchangeable pleated filters in a folded state and / or first, second, third, and fourth retainers in a disassembled state into a combined packaging container or a separate packaging container to form at least one finished package, thereby significantly reducing the space volume of the finished package;

[0189] (c) Delivering the finished package to the location of use; and

[0190] (d) Assemble the interchangeable filters and the reusable filter system for use.

[0191] 46. ​​Use of the reusable filter system as described in any of the foregoing embodiments in an air filtration system.

[0192] 47. The use as described in Example 46, wherein the air filtration system is one or more systems selected from the group consisting of: heating, ventilation, and air conditioning (HVAC) systems, air conditioning and mechanical ventilation (ACMV) systems, central mechanical ventilation and air conditioning (MVAC) systems, variable refrigerant volume (VRV) or split-flow systems, air handling units (AHU), makeup air units (MAU), primary air units (PAU), and fan coil units (FCU).

[0193] 48. An air filtration method using a reusable filter system as described in any of the foregoing embodiments, the method comprising the step of applying the reusable filter system to an air filtration system.

[0194] 49. The method of Example 48, wherein the air filtration system is one or more systems selected from the group consisting of: heating, ventilation and air conditioning (HVAC) systems, air conditioning and mechanical ventilation (ACMV) systems, central mechanical ventilation and air conditioning (central MVAC) systems, variable refrigerant flow (VRV) or split systems, air handling units (AHUs), fresh air systems (MAUs), fresh air units (PAUs), and fan coil units (FCUs).

[0195] Group 3

[0196] 1. A reusable filter system, comprising:

[0197] (a) An interchangeable filter having a plurality of pleats, each pleat having a pleat height, a pleat width, and a cross section defining a pleat profile, the filter having a first pleated edge and an opposing second pleated edge generally perpendicular to the pleating direction, a first side and an opposing second side generally parallel to the pleating direction, and an upper pleat top surface and an opposing lower pleat top surface; and

[0198] (b) A reusable framework, said reusable framework comprising:

[0199] (i) A first retainer, the size and shape of which are configured to retain the plurality of pleats along the first pleated edge;

[0200] (ii) A second retainer, the size and shape of which are configured to retain the plurality of pleats along the second pleated edge;

[0201] (iii) a third retainer, the third retainer being sized and shaped to retain the plurality of pleats along the first side; and

[0202] (iv) A fourth retainer, the fourth retainer being sized and shaped to retain the plurality of folds along the second side;

[0203] (v) At least one pleated spacer, said at least one pleated spacer being connectable to the frame.

[0204] The first, second, third, and fourth retainers are configured to be reversibly connected to each other to form the reusable frame, which has a cavity to receive the filter when the system is in an assembled state.

[0205] Each of the at least one pleated spacer includes a plurality of spacer elements whose size and shape are configured to match the plurality of pleats, thereby maintaining the spaced pleat profile of the filter when the system is in the assembled state.

[0206] 2. The reusable filter system as described in Example 1, wherein the number of spacer elements generally matches the number of pleats, and each spacer element has a spacer element width generally matching the width of the pleats.

[0207] 3. The reusable filter system as described in Embodiment 1 or 2, wherein the at least one pleated spacer is provided in the form of a spring connectable to the third and fourth retainers, and the plurality of spacer elements are provided in the form of a plurality of coils, each coil being sized and shaped to match the pleat width.

[0208] 4. A reusable filter system as described in Embodiment 1 or 2, wherein the at least one pleated spacer is provided in the form of a serrated member that generally follows at least a portion of the pleated profile.

[0209] 5. The reusable filter system as described in Example 1, wherein,

[0210] The first retainer includes a pair of first clamping members, each having an engagement surface that is complementary to each other, the shape of the engagement surfaces generally matching the fold profile along the first folded edge; and

[0211] The second retainer includes a pair of second clamping members, each having an engagement surface that is complementary to each other, the shape of which generally matches the fold profile along the second folded edge.

[0212] Such that when the system is in the assembled state, the filter is clamped between the first clamp and the second clamp along at least a portion of the first pleated edge and the second pleated edge.

[0213] 6. The reusable filter system as described in Example 1, wherein,

[0214] The first retainer includes a first plate and a plurality of spaced-apart first teeth extending vertically from the longitudinal side of the first plate; and / or

[0215] The second retainer includes a second plate and a plurality of spaced-apart second teeth extending vertically from the longitudinal side of the second plate.

[0216] The spacing between two adjacent first teeth and / or second teeth is configured to match the corresponding fold width, and the tooth height is configured to match the corresponding fold height, thereby maintaining a spaced fold profile along the first side and / or the second side.

[0217] 7. A reusable filter system as described in Embodiment 1 or 2, wherein the pleated spacer includes a spacer plate and a plurality of spacer teeth extending perpendicularly from the longitudinal side of the spacer plate, wherein the spacing between two adjacent spacer teeth is configured to match the corresponding pleat width, and the tooth height is configured to match the corresponding pleat height.

[0218] 8. A reusable filter system as described in any of the foregoing embodiments, wherein the at least one pleated spacer is configured to be connected to the third retainer and the fourth retainer.

[0219] 9. A reusable filter system as described in any of the foregoing embodiments, wherein the system further comprises:

[0220] At least one flexible sheet, the at least one flexible sheet being configured to be attached to at least a portion of the upper top surface of the fold and / or the lower top surface of the fold and extending outwardly from the first fold edge and the second fold edge to form a first fold edge extension and a second fold edge extension, respectively; and

[0221] At least one stopper,

[0222] Each of the first retainer, the second retainer, the third retainer, and the fourth retainer further includes a plug receiving portion, the plug receiving portion being sized and shaped to receive the plug, such that when the at least one plug is installed in the plug receiving portion, the plug receiving portion of each of the first retainer, the second retainer, the third retainer, and the fourth retainer is respectively able to frictionally secure the first pleated edge extension, the second pleated edge extension, the first side, and the second side within the plug receiving portion.

[0223] 10. The reusable filter system as described in Example 9, wherein the at least one flexible sheet is at least partially permeable to air.

[0224] 11. A reusable filter system as described in Example 9 or 10, wherein the at least one flexible sheet is fixedly attached to the filter by adhesive, thermal bonding and / or ultrasonic welding.

[0225] 12. The reusable filter system as described in Example 9 or 10, wherein the at least one flexible sheet is a continuous sheet, the size and shape of which are configured to cover the entire upper top surface of the fold or the entire lower top surface of the fold and extend outward from the first fold edge and the second fold edge.

[0226] 13. The reusable filter system as described in any of the foregoing embodiments, wherein the at least one flexible sheet comprises a first flexible sheet and a second flexible sheet, the first flexible sheet being sized and shaped to cover the entire upper top surface of the fold or the entire lower top surface of the fold and extending outward from the first fold edge, and the second flexible sheet being sized and shaped to cover the entire upper top surface of the fold or the entire lower top surface of the fold and extending outward from the second fold edge.

[0227] 14. A reusable filter system as described in any of the foregoing embodiments, wherein, when the system is in the assembled state, all the plug receiving portions together form a continuous plug channel for receiving plugs.

[0228] 15. A reusable filter system as described in any of the foregoing embodiments, wherein each strip receiving portion further includes at least one ridge to frictionally confine the strip within the strip receiving portion.

[0229] 16. The reusable filter system as described in any of the foregoing embodiments, wherein the plug strip further includes plug strip flaps extending along the longitudinal length of the plug strip to confine the first pleated edge, the second pleated edge, the first side and / or the second side within the frame when the system is in the assembled state.

[0230] 17. The reusable filter system as described in Example 18, wherein the plug further includes a neck portion that connects the plug and the plug flap.

[0231] 18. The reusable filter system as described in Example 19, wherein the neck portion further includes at least one recess, and the plug receiving portion further includes at least one ridge, the size and shape of which are configured to mate with the corresponding recess to hold the plug in the plug receiving portion.

[0232] 19. The reusable filter system as described in any of the foregoing embodiments, wherein the reusable frame further includes a plurality of connectors, each connector being configured to reversibly connect the two ends of any two of the first retainer, the second retainer, the third retainer, and the fourth retainer together.

[0233] 20. The reusable filter system as described in any of the foregoing embodiments further includes at least one support member connected to the reusable frame.

[0234] 21. The reusable filter system as described in Example 20, wherein the at least one support is configured to connect between the third retainer and the fourth retainer.

[0235] 22. A reusable filter system as described in Example 20 or 21, wherein the at least one support member is a rigid rod comprising a rectangular, slotted, or trapezoidal cross section.

[0236] 23. A reusable filter system as described in any one of Examples 20 to 22, wherein the at least one support member is a pair or more pairs of cross members pivotally connected to each other in one direction, each pair of cross members being pivotally connected at a central connection point, wherein the pair or more pairs of cross members are configured to connect the third retainer and the fourth retainer such that the third retainer and the fourth retainer can be switched between an assembled position and a disassembled position.

[0237] 24. A reusable frame for an interchangeable pleated filter, the filter having a plurality of pleats, each pleat having a pleat height, a pleat width, and a cross section defining a pleat profile, the filter having a first pleated edge and an opposing second pleated edge generally perpendicular to the pleating direction, a first side and an opposing second side generally parallel to the pleating direction, and an upper pleated top face and an opposing lower pleated top face, the filter further comprising at least one flexible sheet configured to be attached to at least a portion of the upper pleated top face and / or the lower pleated top face and extending outwardly from the first pleated edge and the second pleated edge to form a first pleated edge extension and a second pleated edge extension, the reusable frame comprising:

[0238] (i) A first retainer, the size and shape of which are configured to retain the plurality of pleats along the first pleated edge;

[0239] (ii) A second retainer, the size and shape of which are configured to retain the plurality of pleats along the second pleated edge;

[0240] (iii) A third retainer, the size and shape of which are configured to retain the plurality of folds along the first side;

[0241] (iv) A fourth retainer, the fourth retainer being sized and shaped to retain the plurality of pleats along the second side; and

[0242] (v) At least one pleated spacer, said at least one pleated spacer being connectable to the frame.

[0243] The first, second, third, and fourth retainers are configured to be reversibly connected to each other to form the reusable frame, which has a cavity to receive the filter when the system is in the assembled state.

[0244] Each of the at least one pleated spacer includes a plurality of spacer elements whose size and shape are configured to match the plurality of pleats, thereby maintaining the spaced pleat profile of the filter when the system is in the assembled state.

[0245] 25. The reusable frame as described in Embodiment 24, wherein each of the first retainer, the second retainer, the third retainer, and the fourth retainer further includes a plug receiving portion, the plug receiving portion being sized and shaped to receive a plug such that when the at least one plug is installed in the plug receiving portion, the plug receiving portion of each of the first retainer, the second retainer, the third retainer, and the fourth retainer is respectively capable of frictionally securing the first pleated edge extension, the second pleated edge extension, the first side, and the second side within the plug receiving portion;

[0246] When the system is in the assembled state, all the plug receiving portions together form a continuous channel for receiving the plug.

[0247] 26. A reusable frame as described in Embodiment 24 or 25, wherein each plug receiving portion further includes at least one ridge to frictionally restrain the plug within the plug receiving portion.

[0248] 27. The reusable frame as described in any one of Embodiments 24 to 26, wherein the plug receiving portion further includes at least one ridge, the size and shape of which are configured to mate with a corresponding recess to hold the plug in the plug receiving portion.

[0249] 28. A reusable frame as described in Example 24, wherein the number of spacer elements generally matches the number of pleats, and each spacer element has a spacer element width generally matching the width of the pleats.

[0250] 29. The reusable frame as described in Embodiment 24, wherein the at least one pleated spacer is provided in the form of a spring connectable to the third and fourth retainers, and the plurality of spacer elements are provided in the form of a plurality of spring coils, each spring coil being sized and shaped to match the pleat width.

[0251] 30. The reusable frame as described in Example 24, wherein the at least one pleated spacer is provided in the form of a serrated member that generally follows at least a portion of the pleated profile.

[0252] 31. The reusable frame as described in Example 24, wherein,

[0253] The first retainer includes a pair of first clamping members, each having an engagement surface that is complementary to each other, the shape of the engagement surfaces generally matching the fold profile along the first folded edge; and

[0254] The second retainer includes a pair of second clamping members, each having an engagement surface that is complementary to each other, the shape of which generally matches the fold profile along the second folded edge.

[0255] Such that when the system is in the assembled state, the filter is clamped between the first clamp and the second clamp along at least a portion of the first pleated edge and the second pleated edge.

[0256] 32. The reusable frame as described in Example 24, wherein,

[0257] The first retainer includes a first plate and a plurality of spaced-apart first teeth extending vertically from the longitudinal side of the first plate; and / or

[0258] The second retainer includes a second plate and a plurality of spaced-apart second teeth extending vertically from the longitudinal side of the second plate.

[0259] The spacing between two adjacent first teeth and / or second teeth is configured to match the corresponding fold width, and the tooth height is configured to match the corresponding fold height, thereby maintaining a spaced fold profile along the first side and / or the second side.

[0260] 33. A reusable frame as described in any one of embodiments 24 to 32, wherein the pleated spacer includes a spacer plate and a plurality of spacer teeth extending perpendicularly from the longitudinal side of the spacer plate, wherein the spacing between two adjacent spacer teeth is configured to match the corresponding pleat width, and the tooth height is configured to match the corresponding pleat height.

[0261] 34. A reusable frame as described in any one of embodiments 24 to 33, wherein the at least one pleated spacer is configured to be connected to the third retainer and the fourth retainer.

[0262] 35. A reusable frame as described in any one of embodiments 24 to 34, wherein the reusable frame further comprises a plurality of connectors, each connector being configured to reversibly connect the two ends of any two of the first retainer, the second retainer, the third retainer, and the fourth retainer together.

[0263] 36. The reusable frame as described in any of the foregoing embodiments further includes at least one support member connected to the frame.

[0264] 37. The reusable frame as described in Embodiment 36, wherein the at least one support is configured to connect between the third retainer and the fourth retainer.

[0265] 38. A reusable frame as described in embodiment 36 or 37, wherein the at least one support member is a rigid rod comprising a rectangular, slotted, or trapezoidal cross section.

[0266] 39. A reusable filter system as described in any one of embodiments 36 to 38, wherein the at least one support member is a pair or more pairs of cross members pivotally connected to each other in one direction, each pair of cross members being pivotally connected at a central connection point, wherein the pair or more pairs of cross members are configured to connect the third retainer and the fourth retainer such that the third retainer and the fourth retainer are switchable between spaced-apart and proximal positions.

[0267] 40. A method of assembling a reusable filter system for interchangeable pleated filters, the method comprising the steps of:

[0268] (a) Provide a reusable filter system as described in any one of Embodiments 1 to 23, the reusable filter system comprising a reusable frame;

[0269] (b) The reusable frame is partially or completely assembled by connecting the first, second, third, and fourth retainers together and attaching at least one pleated spacer to the reusable frame:

[0270] (c) Installing the interchangeable pleated filter into the reusable frame; and

[0271] (d) If the reusable frame is partially assembled, then assemble the reusable frame completely.

[0272] 41. The method as described in Example 40 includes the following steps:

[0273] At least one plug is installed to the plug receiving portion of the reusable frame, and / or at least one flexible sheet is attached to the interchangeable pleated filter.

[0274] 42. The method as described in Example 40, wherein step (b) further comprises:

[0275] The first retainer, the second retainer, the third retainer, and the fourth retainer are connected by multiple connectors.

[0276] 43. The method as described in Example 40 includes the following steps:

[0277] At least one support member is installed onto the reusable frame.

[0278] 44. A method for transporting a reusable filter system, the method comprising the steps of:

[0279] (a) Providing a reusable filter system as described in any one of Examples 1 to 23 in a disassembled state;

[0280] (b) Packaging the interchangeable pleated filters in a folded state and / or the reusable filter system in a disassembled state into one or more packaging containers to form at least one finished package.

[0281] This results in a significant reduction in the spatial volume of the finished packaging;

[0282] (c) Delivering the finished package to the location of use; and

[0283] (d) Assemble the reusable filter system for use.

[0284] 45. Use of the reusable filter system as described in any of the foregoing embodiments in an air filtration system.

[0285] 46. ​​The use as described in Example 45, wherein the air filtration system is one or more systems selected from the group consisting of: heating, ventilation and air conditioning (HVAC) systems, air conditioning and mechanical ventilation (ACMV) systems, central mechanical ventilation and air conditioning (central MVAC) systems, variable refrigerant flow (VRV) or split systems, air handling units (AHUs), fresh air systems (MAUs), fresh air units (PAUs), and fan coil units (FCUs).

[0286] 47. An air filtration method using a reusable filter system as described in any of the foregoing embodiments, the method comprising the step of applying the reusable filter system to an air filtration system.

[0287] 48. The method of Example 47, wherein the air filtration system is one or more systems selected from the group consisting of: heating, ventilation and air conditioning (HVAC) systems, air conditioning and mechanical ventilation (ACMV) systems, central mechanical ventilation and air conditioning (central MVAC) systems, variable refrigerant flow (VRV) or split systems, air handling units (AHUs), fresh air systems (MAUs), fresh air units (PAUs), and fan coil units (FCUs).

[0288] Example

[0289] This document provides examples of certain embodiments that describe the disclosure in more detail. The examples provided herein are for illustrative purposes only and are not intended to limit the scope of the invention in any way. All references set forth below and elsewhere in this application are hereby incorporated herein by reference.

[0290] For ease of description, all subsequent figures with the same reference numerals refer to the same parts and will not be repeated in the description of each figure.

[0291] Example Implementation 1: Reusable Filter Frame and System 1000

[0292] Figure 1A An exploded perspective view of an example reusable filter system 1000 is shown. The filter system 1000 includes interchangeable filter materials 1100 and a reusable frame 1200. The filter 1100 includes a plurality (e.g., twenty-three) longitudinally extending pleats 1110. When the filter is unfolded in an assembled state, each pleat has a pleat height, a pleat width, and a cross-section defining the pleat profile. The filter 1100 has a first pleated edge 1120 generally perpendicular to the pleating direction, an opposing second pleated edge 1130, a first side 1140 generally parallel to the pleating direction, and an opposing second side 1150. As an example, the filter 1100 may be a HEPA filter. As an example, the filter 1100 may be made of woven and / or nonwoven (various) filter materials. As an example, the pleat profile may be continuous or discrete rectangular, triangular, trapezoidal, and / or oval shapes.

[0293] Still referencing Figure 1A The reusable frame 1200 includes a first retainer 1210, a second retainer 1220, a third retainer 1230 (partially shown), a first connector 1240, and a second connector 1250. The first retainer 1210 and the second retainer 1220 are sized and shaped to cover and support each of a plurality of pleats of the filter 1100 along the first pleated edge 1120 and the second pleated edge 1130, respectively. The first connector 1240 and the second connector 1250 are reversibly connected to the first retainer 1210 and the second retainer 1220 along the first side edge 1140 and the second side edge 1150, respectively. Figures 1D to 1F The retainer and connector are shown more clearly and described in more detail. Optionally, the frame 1200 may further include multiple (e.g., five) clips 1270. As an example, the frame may be made of a fire-resistant material (e.g., a metal such as aluminum or a plastic such as PP).

[0294] Figures 1B to 1CA perspective view of the same filter system 1000 in an assembled state is shown. The first retainer 1210, the second retainer 1220, and the third retainer 1230, together with the first connector 1240 and the second connector 1250, form a rectangular frame 1200 and a cavity in the frame for mateably receiving the filter 1100, thereby providing strong mechanical protection for the filter 1100 and maintaining the pleated structure or geometry of the filter media.

[0295] Now for reference Figures 1D to 1F The frame 1200 is shown and described in more detail. Figures 1D to 1ETwo opposite exploded perspective views of an example reusable frame 1200 (without filter material) in a disassembled state are shown. A first retainer 1210 includes an elongated first plate 1211 and a plurality of spaced-apart first teeth 1212 extending vertically from the longitudinal side of the first plate 1211, each first tooth 1212 having a right-angled trapezoidal longitudinal cross-section. The first plate 1211 further includes a flap extending along its top longitudinal side. This flap helps retain the filter within the frame 1200 even when the frame 1200 is inverted during filter installation. Similarly, a second retainer 1220 includes a second plate 1221 and a plurality of spaced-apart second teeth 1222 extending vertically from the longitudinal side of the second plate 1221, each second tooth 1222 having a right-angled trapezoidal shape in its longitudinal cross-section. The second plate 1221 further includes a flap extending along its top longitudinal side. When the filter is installed, this wing helps to hold the filter within the frame 1200 even when the frame 1200 is placed upside down. The spacing between two adjacent teeth generally matches the corresponding pleat width of the filter. The tooth height generally matches the corresponding pleat height. In this way, the frame is suitable for use with various filter materials having similar pleat heights and pleat widths but different pleat profiles or geometries, making the system a universal fitting for filters with different pleat profiles. Slots 1213a, b and 1223a, b are respectively provided near each longitudinal end of the first retainer and the second retainer. Protrusions 1242a, b and 1252a, b are respectively provided at each longitudinal end of the first connector 1240 and the second connector 1250. These slots 1213a, b and 1223a, b, and protrusions 1242a, b and 1252a, b are configured such that they can reversibly engage together to form a rectangular frame. The third retainer 1230 is positioned laterally at the middle of the filter, with its longitudinal side generally perpendicular to the pleating direction. The third retainer 1230 is sized and shaped to support multiple pleats along its middle position. The third retainer 1230 includes an elongated third plate 1231 and a plurality of spaced-apart third teeth 1232 extending vertically from the longitudinal side of the third plate, each third tooth 1232 having a symmetrical trapezoidal longitudinal cross-section. The spacing between two adjacent third teeth 1232 is configured to match the corresponding pleat width, and the tooth height is configured to match the corresponding pleat height of the filter. Third fastening portions 1233a and 1233b are provided at each longitudinal end of the third retainer. Recessed portions 1243 and 1253 are provided at the middle of the longitudinal sides of the first connector 1240 and the second connector 1250, respectively. These third fastening portions 1233a, b and recessed portions 1243 and 1253 are configured such that they can reversibly and cooperatively engage together to reinforce the mechanical support of the frame in the intermediate position.

[0296] Figure 1F A perspective view of the same filter frame 1200 in an assembled state is shown. When assembled, retainers 1210, 1220, and 1230, together with connectors 1240 and 1250, form a rectangular frame 1200. Example Implementation Example 2: Reusable Filter System 2000

[0297] Figure 2A A perspective view of another example reusable filter system 2000 in an assembled state is shown. The filter system 2000 includes interchangeable filter materials 2100 and a reusable frame 2200.

[0298] Figure 2B An exploded view of system 2000 is shown, which includes a filter 2100 with a triangular pleated profile and a reusable frame 2200 including a first retainer 2210, a second retainer 2220, a third retainer 2230, a first connector 2240, and a second connector 2250. The first retainer 2210 includes an upper first clamping member 2211a and a lower first clamping member 2211b, and the second retainer 2220 includes an upper second clamping member 2221a and a lower second clamping member 2221b. The shapes of each pair of clamping members 2211a,b and 2221a,b are complementary to each other. Retainers 2210, 2220, and 2230 have serrated surfaces facing the filter. Clamping members 2211a, b and 2221a, b have a generally identical profile in their mating surfaces to the pleated profile of filter 2100, such that filter 2100 can be secured between the retainers, thereby holding the uniformly spaced pleated structure of filter 2100 in place when system 2000 is in the assembled state. The first retainer 2210 and the second retainer 2220 further include vertical extensions at each longitudinal end, these extensions being shaped to be inserted into the first connector 2240 and the second connector 2250, respectively, at the positions indicated by the arrows.

[0299] Example 3: Preparation and Assembly of a Filter System

[0300] In an example embodiment, a method for preparing a filter system is provided, the method comprising the following steps:

[0301] (a) A filter material comprising a plurality of pleats, each pleat having a pleat height, a pleat width and a cross section defining a pleat profile, the filter having a first pleated edge generally perpendicular to the pleating direction and an opposing second pleated edge defining a variable filter width, and a first side generally parallel to the pleating direction and an opposing second side defining a filter length.

[0302] (b) A reusable frame is provided, the frame comprising: a first retainer sized and shaped to cover and support each of the plurality of pleats along a first pleated edge; a second retainer sized and shaped to cover and support each of the plurality of pleats along a second pleated edge; a first connector connectable to the first retainer and the second retainer along a first side; and a second connector connectable to the first retainer and the second retainer along a second side.

[0303] (c) When the system is in a disassembled state, the filter is packaged in a folded form, and the retainer and frame are packaged in a compact (e.g., staggered or stacked) arrangement, and

[0304] When the system is in the assembled state, the filter and the frame formed by the retainer and connector are assembled such that the first retainer and the second retainer interact with the plurality of pleats to enclose the filter and hold the spaced-apart pleated structure of the filter.

[0305] Example 4: Transport Packaging Method

[0306] In one example embodiment, a method for a transport filter system is provided, the method comprising the following steps:

[0307] (a) Provide a filter system as described herein in a disassembled state.

[0308] (b) Packaging folded filters and / or compactly arranged (e.g., staggered or stacked) retainers and connectors into a combined or separate packaging container to form finished packages, thereby significantly reducing the space volume of the finished packages. For example, the folded filter 3100 in its disassembled state and the frame 3200 (retainer and connector) can be packaged together in a K3K package 3300, such as... Figure 3A As shown, six such K3K packages 3300 can then be further packaged in an A3A box 3400, as... Figure 3B As shown. For example, the filter and frame (retainer and connector) can be packaged separately. For example, two folded filters 4100 can be packaged in a K3K package 4300, as shown. Figure 4A As shown, six such K3K packages 4300 can then be further packaged in an A3A box 4400, as... Figure 4B As shown. For example, five folded filters 5100 can be packaged in a single K3K package 5300, as shown. Figure 5AAs shown, six such K3K packages 5300 can then be further packaged in an A3A box 5400, as... Figure 5B As shown. For example, ten folded filters can be packaged in two layers (each layer containing five filters 6100) in a K3K package 6300, as shown. Figure 6A As shown, three such K3K packages 6300 can then be further packaged in an A3A box 6400, as follows. Figure 6B As shown.

[0309] (c) Deliver (multiple) finished packages to the location where they are intended for use.

[0310] (d) Assemble the filter and the frame into a filter system for use. For example, a used filter system can be disassembled, and the used filter can be disposed of. The frame can be reused with a new filter.

[0311] Example 5: Method for assembling a filter system

[0312] To assemble a reusable filter system, the following steps are included:

[0313] (i) Provide a filter system as described herein in a disassembled state.

[0314] (ii) Connect the first retainer to the first connector and the second connector to form a partially open frame.

[0315] (iii) Optionally, the third retainer is connected to the first connector and the second connector.

[0316] (iv) Install interchangeable filters onto the partial frame.

[0317] (v) Attach the second retainer to the partial frame.

[0318] (vi) Optionally, at least a portion of the filter is fastened to the frame by a plurality of clips.

[0319] The first and second connectors are connected to the third retainer to form a frame having a cavity for accommodating the filter. When the system is in the assembled state, the first and second retainers interact with a plurality of pleats to hold the spaced-apart pleated structure of the filter, such that each of the first and second connectors is connected to the first and second retainers to form a frame having a cavity for accommodating the filter. When the system is in the assembled state, the first and second retainers interact with a plurality of pleats to hold the spaced-apart pleated structure of the filter.

[0320] In the following examples, the first and second connectors described in the preceding example embodiments 1 to 5 are referred to as the third retainer and the fourth retainer, respectively; the third retainer described in the preceding example embodiments 1 to 5 is referred to as the support member and / or the pleated spacer member; and the wing described in the preceding example embodiments 1 to 5 is referred to as the retainer wing.

[0321] Example Implementation 6: Reusable Filter Frame 7200 and System 7000

[0322] Figures 7A to 7G Another example of a reusable filter system 7000 is shown, which generally includes a reusable frame 7200 and two pleated spacers 7231 and 7232. Figure 7A This is an exploded perspective view of an example reusable filter system 7000. The filter system 7000 includes a reusable frame 7200 that holds interchangeable filter material 7100. The filter 7100 includes a plurality of longitudinally extending, generally equally spaced pleats 7110. When the filter is unfolded in an assembled state, each pleat has a pleat height, a pleat width, and a cross-section defining the pleat profile. The filter 7100 has a first pleated edge 7120 generally perpendicular to the pleating direction and an opposing second pleated edge 7130, a first side 7140 generally parallel to the pleating direction and an opposing second side 7150, an upper pleated surface 7101, and an opposing lower pleated surface (not shown). For ease of description, the direction toward the upper pleated surface 7101 is referred to as upper, and the direction toward the lower pleated surface is referred to as lower (or low). In this example, the plurality of pleat profiles have continuous V-shaped (or serrated) cross-sections, and the filter generally has a uniform pleat width and pleat height. In some examples, filter 7100 may be made of woven and / or nonwoven (multiple) filter materials. In some examples, filter 7100 is reusable (e.g., after cleaning and / or disinfection) or disposable. In one example, the filter is a HEPA filter.

[0323] Still referencing Figure 7AThe reusable frame 7200 includes a first retainer 7210, a second retainer 7220, a third retainer 7240, and a fourth retainer 7250. The first retainer 7210 and the second retainer 7220 are sized and shaped to cover and support a plurality of pleats of the filter 7100 along a first pleated edge 7120 and a second pleated edge 7130, respectively. The third retainer 7240 and the fourth retainer 7250 are sized and shaped to cover and support the filter 7100 along a first side edge 7140 and a second side edge 7150, respectively. In this embodiment, the frame 7200 further includes four frame connectors 7270A-7270D adapted to reversibly connect two longitudinal ends of any two of the first retainers 7210, the second retainer 7220, the third retainer 7240, and the fourth retainer 7250 to each other. Figures 7C to 7E The structure and connection of the retainer and frame connector are shown more clearly and described in more detail. The retainer can be made of rigid materials such as metal (e.g., aluminum), alloy (e.g., steel), plastic (e.g., PC, ABS, PVC), elastomer (e.g., EPDM), or silicone rubber.

[0324] The filter system 7000 further includes two pleated spacers 7231 and 7232 connectable to a reusable frame 7200. Each of the two pleated spacers 7231 and 7232 has a plurality of spacer elements whose dimensions and shapes are configured to match the plurality of pleats 7110 of the filter 7100. The term “match” means that when the system is in an assembled state, the number of spacer elements is equal to or approximately close to the number of pleats, and the width of each spacer element is equal to or approximately close to the pleat width. The profile of each spacer element may generally follow the pleat profile, but is not necessarily identical. In this embodiment, each of the pleated spacers 7231 and 7232 is provided in the form of a spring connectable to a third retainer 7240 and a fourth retainer 7250, and the plurality of spacer elements are provided in the form of a plurality of spring coils. Specifically, the pleat spacer 7231 is a spring having an end 7231A connectable to the third retainer 7240, another opposing end 7231B connectable to the fourth retainer 7250, and a plurality of coils 7231C between the two ends, each coil being sized and shaped to match the pleat width of the filter 7100. The pleat spacer 7232 is a spring having an end 7232A connectable to the third retainer 7240, another opposing end 7232B connectable to the fourth retainer 7250, and a plurality of coils 7232C between the two ends, each coil being sized and shaped to match the pleat width of the filter 7100. In some embodiments, the number of coils 7231C and 7232C is approximately equal to the number of pleats 7110 of the filter 7100 to maintain the pleated structure or geometry of the filter 7100.

[0325] Figure 7BA perspective view of the same filter system 7000 in an assembled state is shown. A first retainer 7210, a second retainer 7220, a third retainer 7240, and a fourth retainer 7250 are connected together via a frame connector to form a rectangular (square) frame 7200 and a cavity within the frame for mateably receiving the filter 7100. Pleated spacers 7231 and 7232 are both connected to the third retainer 7240 and the fourth retainer 7250, and extend parallel to the upper pleated surface 7101 of the filter 7100 and generally perpendicular to the pleating direction of the filter 7100. In this embodiment, each coil 7231C and 7232C of the corresponding pleat spacers 7231 and 7232 has a generally uniform coil width that generally matches the pleat width of the pleat 7110, such that each pleat 7110 can be contained within the winding of each coil, thereby acting as a support to provide strong mechanical support for the filter 7100 when the system is in the assembled state, while maintaining the spaced pleat profile of the filter 7100. In some other embodiments, one or more pleats can be contained within the winding of each coil.

[0326] Now for reference Figure 7C The reusable frame 7200 is shown and described in more detail. Figure 7CAn exploded perspective view of an example reusable frame 7200 (without filter material and pleated spacers) in a disassembled state is shown. The first retainer 7210 includes: an elongated first plate 7211 having two opposing longitudinal ends 7211A and 7211B; an upper retainer flap 7212 extending along the top longitudinal side of the first plate 7211; and a lower retainer flap 7213 extending along the bottom longitudinal side of the first plate 7211. The upper and lower retainer flaps 7212 and 7213 are isosceles trapezoidal in shape, allowing the retainers to be assembled with each other. When the filter is installed, these retainer flaps help retain or confine the filter within the frame 7200 even when the frame 7200 is placed upside down. Similarly, the second retainer 7220 includes: an elongated second plate 7221 having two opposing ends 7221A and 7221B; an upper retainer flap 7222 extending along the top longitudinal side of the second plate 7221; and a lower retainer flap (not shown) extending along the bottom longitudinal side of the second plate 7221; the third retainer 7240 includes: an elongated third plate 7241 having two opposing ends 7241A and 7241B; and an upper retainer flap 7242 extending along the bottom longitudinal side of the second plate 7221. The retainer 7240 comprises: an upper retainer flap 7243 extending along the top longitudinal side of the third plate 7241; and a lower retainer flap 7243 extending along the bottom longitudinal side of the third plate 7241; the fourth retainer 7250 includes: an elongated fourth plate 7251 having two opposing ends 7251A and 7251B; an upper retainer flap 7252 extending along the top longitudinal side of the fourth plate 7251; and a lower retainer flap (not shown) extending along the bottom longitudinal side of the fourth plate 7251. In this example, the first retainer 7210, the second retainer 7220, the third retainer 7230, and the fourth retainer 7240 are structurally identical or very similar to each other, and therefore easy to manufacture. In this embodiment, the upper retainer flap 7242 of the third retainer 7240 includes two notches 7246 and 7247 for connection with a pleated spacer. Similarly, the retainer upper flap 7252 of the fourth retainer 7250 includes two notches 7256 and 7257 at corresponding locations for connection with the pleated spacer. Figures 7F to 7G The structure of these notches is described in detail.

[0327] In this embodiment, four L-shaped frame connectors 7270A-7270D are provided, each having two arms that are generally perpendicular to each other and configured to reversibly connect two retainers at their respective ends. In this example, each arm of the frame connector includes two spherical protrusions on two opposing surfaces, each spherical protrusion being surrounded by a C-shaped slit, such that when the arm is inserted into the gap formed by the ridge, the frame connector can frictionally (and reversibly) abut against the retainer. In this example, the overall profiles of the frame connectors 7270A-7270D are identical or very similar to each other, thus making them easy and inexpensive to manufacture. For example, frame connector 7270A is adapted to reversibly connect end 7211A of first retainer 7210 to end 7241B of third retainer 7240; frame connector 7270B is adapted to connect end 7211B of first retainer 7210 to end 7251A of fourth retainer 7250; frame connector 7270C is adapted to connect end 7251B of fourth retainer 7250 to end 7221B of second retainer 7220; and frame connector 7270D is adapted to connect end 7221A of second retainer 7220 to end 7241A of third retainer 7240.

[0328] Now for reference Figures 7D to 7F . Figure 7D The connection between the first retainer 7210 and the third retainer 7240 via the frame connector 7270A is shown. (Reference) Figure 7D and Figure 7E The first retainer 7210 further includes an upper ridge 7214 on its inner side, which extends downward and generally vertically along the length of the upper retainer flap 7212, defining a gap between the upper ridge 7214 and the first plate 7211. The first retainer 7210 also includes a lower ridge 7215 on its inner side, which extends upward and generally vertically along the length of the lower retainer flap 7213, defining a gap between the lower ridge 7215 and the first plate 7211. The width of the gap between the upper ridge 7214 and the first plate 7211 is approximately the same as the width of the gap between the lower ridge 7215 and the first plate 7211, and the two gaps together form an internal channel 7216 suitable for slidably receiving the arm of the frame connector 7270A.

[0329] Now for reference Figure 7D and Figure 7FThe third retainer 7240 further includes an upper ridge 7244 that extends downward and generally vertically from the upper retainer flap 7242 along the length of the upper retainer flap 7242, defining a gap between the upper ridge 7244 and the third plate 7241. The third retainer 7240 also includes a lower ridge 7245 that extends upward and generally vertically from the lower retainer flap 7243 along the length of the lower retainer flap 7243, defining a gap between the lower ridge 7244 and the third plate 7241. The width of the gap between the upper ridge 7244 and the third plate 7241 is substantially the same as the width of the gap between the lower ridge 7245 and the third plate 7241, and the two gaps together form an internal channel 7248 suitable for slidably receiving the arm of the frame connector 7270A.

[0330] Thus, when one arm of the frame connector 7270A is inserted into the internal channel 7216 of the first retainer 7210 ( Figure 7E When the other arm of the frame connector 7270A is inserted into the internal channel 7248 of the third retainer 7240, the connection between the first retainer 7210 and the third retainer 7240 can be maintained.

[0331] In this embodiment, the connection between the other retainers via the frame connector is generally similar to the connection between the first retainer 7210 and the third retainer 7240 via the frame connector 7270A as described above. Thus, when the system 7000 is in an assembled state (e.g., Figure 7B As shown, the frame connectors are not exposed on the outside of the reusable frame 7200, giving the reusable frame a neater and better appearance.

[0332] In this embodiment, such as Figure 7F As shown, the third retainer 7240 further includes an upper recess 7244A extending along the length of the upper ridge 7244 and a lower recess 7245A extending along the length of the lower ridge 7245. The dimensions and shapes of the upper recess 7244A and the lower recess 7245A are configured to receive and retain the end fold of the filter on the first side (e.g., Figure 7G (As shown). Although not shown, it should be understood that the fourth retainer (not shown) is structurally similar to the third retainer and further includes an upper recess and a lower recess to receive and hold the filter at opposite end folds on the second side.

[0333] Still referencing Figure 7FThe upper retainer flap 7242 of the third retainer 7240 includes two notches 7246 and 7247 for connection with the pleated spacer. In this embodiment, notch 7246 is formed by a rectangular (or square) piece 7246A cut from the upper retainer flap 7242, one longitudinal side of which remains attached to the upper retainer flap 7242, and the other side is bent downward at an angle toward the third plate 7241, thereby forming a hole 7246B in the upper retainer flap 7242. In this embodiment, the pleated spacer 7231 has an annular end 7231A, the diameter of which is slightly larger than the length of the longitudinal side of the rectangular piece 7246A. The rectangular piece 7246A serves as an anchor, and the annular end 7231A of the pleated spacer 7231 is attached to the rectangular piece, thereby securing the connection between the pleated spacer 7231 and the third retainer 7240. The notch 7247 has a similar structure to the notch 7246 for securing the connection between another pleated spacer (not shown) and the third retainer 7240.

[0334] Now for reference Figure 7G This illustrates the interaction between the pleated spacer 7231, the filter 7100, and the third retainer 7240 when the system is in an assembled state. The pleated spacer 7231 is attached to the third retainer 7240 via an annular end 7231A and a notch 7246, and extends generally perpendicular to the pleating direction of the filter 7100. In this embodiment, each coil 7231C of the pleated spacer 7231 has a coil width that generally matches the pleat width of the pleat 7110, such that each pleat 7110 can be contained within the winding of each coil 7231C, thereby providing strong mechanical support for the filter 7100 and maintaining the spaced pleat profile of the filter 7100 when the system is in an assembled state. The upper recess 7244A and the lower recess 7245A together receive and hold the last pleat of the filter 7100 on the first side, thereby securing the connection between the filter 7100 and the third retainer 7240. In general, the upper and lower recesses of the third and fourth retainers respectively secure the first and second sides of the filter to the reusable frame. In one example, the pleated spacer 7231 is a cylindrical helical spring made of metal (e.g., aluminum), alloy (e.g., steel), plastic (e.g., PC, ABS, PVC), elastomer (e.g., EPDM), or silicone rubber.

[0335] Example 7: Example pleated spacer 8231

[0336] Now for reference Figure 8 This illustrates another embodiment of an example pleated spacer that can be adapted to any reusable frame and system described herein. Figure 8The interaction between the pleated spacer 8231, the filter 8100, and the third retainer 8240 is illustrated when the system is in an assembled state. In this embodiment, the filter 8100 and the third retainer 8240 have a structure generally similar to that of the filter and third retainer described in Example Embodiment 6. The pleated spacer 8231 is provided in the form of a serrated member that generally follows the pleat profile of a plurality of longitudinally extending pleats 8110 and extends generally perpendicular to the pleating direction of the filter 8100, thereby providing strong mechanical support for the filter 8100 and maintaining the spaced pleat profile of the filter 8100 when the system is in an assembled state. In this example, the pleated spacer 8231 is a serrated (with smooth corners) spring or wire made of a rigid material such as metal and alloy or plastic. This example pleated spacer 8231 can be applied to any of the other example embodiments described herein.

[0337] Example Implementation 8: Reusable Filter Frame 9200 and System 9000

[0338] Figure 9A A perspective view of another example reusable filter system 9000 in an assembled state is shown. The filter system 9000 has a generally similar structure to the filter system 7000 described in Example Embodiment 6, including a reusable frame 9200 for interchangeable filter materials 9100, and two pleated spacers 9231 and 9232. The reusable frame 9200 includes a first retainer 9210, a second retainer 9220, a third retainer 9240, and a fourth retainer 9250. In this embodiment, the frame 9200 further includes four frame connectors 9270 (although in...). Figure 9A (Only three are shown in the example). These four frame connectors are configured to reversibly connect the first retainer 9210, the second retainer 9220, the third retainer 9240, and the fourth retainer 9250 to each other to form a reusable frame 9200. In this example embodiment, the upper and lower ridges (and therefore the gaps) of the retainers are located on the outside, and when the system is in the assembled state, the frame connector 9270 is exposed to the outside of the reusable frame 9200, and the structure and connection of the retainers and frame connectors differ from the structure and connection described in example embodiment 6, which will combine Figures 9B to 9D To provide a more detailed description.

[0339] Now for reference Figures 9B to 9D . Figure 9B The connection between the first retainer 9210 and the third retainer 9240 via the frame connector 9270 is shown. (Reference) Figure 9B and Figure 9CThe first retainer 9210 includes: an elongated first plate 9211; an upper retainer flap 9212 extending along the top longitudinal side of the first plate 9211; and a lower retainer flap 9213 extending along the bottom longitudinal side of the first plate 9211. In this embodiment, the upper retainer flap 9212 has an extension 9212A that projects outward toward the outside of the first plate 9211. The first retainer 9210 further includes an upper ridge 9214 at the outer side of the first plate 9211, the upper ridge extending downward and generally vertically along the length of the upper retainer flap 9212 from the extension 9212A, defining a gap between the upper ridge 9214 and the outer side of the first plate 9211. Similarly, the lower retainer flap 9213 has an extension 9213A at the outer side of the first plate 9211, the extension projecting outward toward the outside of the first plate 9211. The first retainer 9210 further includes a lower ridge 9215 extending upward and generally vertically along the length of the lower retainer flap 9213 from the extension 9213A, defining a gap between the lower ridge 9215 and the outer side of the first plate 9211. The width of the gap between the upper ridge 9214 and the outer side of the first plate 9211 is approximately the same as the width of the gap between the lower ridge 9215 and the outer side of the first plate 9211, and the two gaps together form an external channel 9216 suitable for slidably receiving the arm of the frame connector 9270.

[0340] Now for reference Figure 9DThe third retainer 9240 includes: an elongated third plate 9241; an upper retainer flap 9242 extending along the top longitudinal side of the third plate 9241; and a lower retainer flap 9243 extending along the bottom longitudinal side of the third plate 9241. In this embodiment, the upper retainer flap 9242 has an extension 9242A that projects outward toward the outside of the third plate 9241. The third retainer 9240 further includes an upper ridge 9244 at the outside of the first plate 9211, the upper ridge extending downward and generally vertically along the length of the upper retainer flap 9242 from the extension 9242A, defining a gap between the upper ridge 9244 and the outside of the third plate 9241. Similarly, the lower retainer flap 9243 has an extension 9243A that projects outward toward the outside of the third plate 9241. The third retainer 9240 further includes a lower ridge 9245 that extends upward and generally vertically along the length of the lower retainer flap 9243 from an extension 9243A of the lower retainer flap 9243, defining a gap between the lower ridge 9245 and the outer side of the third plate 9241. The width of the gap between the upper ridge 9244 and the outer side of the third plate 9241 is approximately the same as the width of the gap between the lower ridge 9245 and the outer side of the third plate 9241, and the two gaps together form an external channel 9246 suitable for slidably receiving the arm of the frame connector 9270.

[0341] Let's refer to this together. Figures 9B to 9D When one arm of the frame connector 9270 is inserted into the external channel 9216 of the first retainer 9210 ( Figure 9C The other arm of the frame connector 9270 is inserted into the external channel 9246 of the third retainer 9240. Figure 9D When the first retainer 9210 and the third retainer 9240 are in the same position, the connection between them can be maintained.

[0342] In this embodiment, the connection between the other retainers via the frame connector is generally similar to the connection between the first retainer 9210 and the third retainer 9240 via the frame connector 9270 as described above. Thus, when the system 9000 is in an assembled state (e.g., Figure 9A As shown, the frame connector is mounted on the outside of the reusable frame 9200.

[0343] Return to reference Figure 9DThe third retainer 9240 further includes: an inner upper ridge 9247 extending downward and generally vertically from the upper retainer flap 9242 at the inside of the third plate 9241; and an upper recess 9247A extending along the length of the inner upper ridge 9247. Similarly, the third retainer 9240 further includes: an inner lower ridge 9248 extending upward and generally vertically from the lower retainer flap 9243 at the inside of the third plate 9241; and a lower recess 9248A extending along the length of the inner lower ridge 9248. The upper recess 9247A and the lower recess 9248A are adapted to receive and retain a pleat (not shown) of the filter on a first side.

[0344] Example Implementation 9: Reusable Filter Frame 10200 and System 10000

[0345] Figures 10A to 10K Another example of a reusable filter system 10000 is shown, which generally includes a reusable frame 10200, two pleated flexible sheets 10410 and 10420, and a plug strip 10310. Figure 10A This is an exploded perspective view of an example reusable filter system 10000. The filter system 10000 includes a reusable frame 10200 that holds interchangeable filter materials 10100. The filter 10100 includes a plurality of longitudinally extending pleats 10110. When the filter is unfolded in an assembled state, each pleat has a pleat height, a pleat width, and a cross section defining the pleat profile. The filter 10100 has a first pleated edge 10120 generally perpendicular to the pleating direction and an opposing second pleated edge 10130, a first side 10140 generally parallel to the pleating direction and an opposing second side 10150, an upper pleated surface 10101, and an opposing lower pleated surface (not shown). The filter 10100 is structurally similar to the filter described in Example Embodiment 6. In this example, the reusable system 10000 or the reusable frame 10200 does not include pleat spacers. Optionally, one or more pleated spacers described in any example embodiment may be included in the reusable system 10000 or the reusable frame 10200.

[0346] Still referencing Figure 10AThe reusable frame 10200 includes a first retainer 10210, a second retainer 10220, a third retainer 10240, and a fourth retainer 10250. The first retainer 10210 and the second retainer 10220 are sized and shaped to cover and support a plurality of pleats of the filter 10100 along a first pleated edge 10120 and a second pleated edge 10130, respectively. The third retainer 10240 and the fourth retainer 10250 are sized and shaped to cover and support the filter 10100 along a first side edge 10140 and a second side edge 10150, respectively. In this embodiment, the frame 10200 further includes four pairs of frame connectors 10270A-10270D, which are adapted to reversibly connect two longitudinal ends of any two of the first retainer 10210, the second retainer 10220, the third retainer 10240, and the fourth retainer 10250 to each other. Figures 10I to 10K The structure and connection of the retainer and frame connector are shown more clearly and described in more detail. In one example, the retainer and connector may be made of rigid materials such as metals (e.g., aluminum), alloys (e.g., steel), plastics (e.g., PC, ABS, PVC), elastomers (e.g., EPDM), or silicone rubber.

[0347] Now for reference Figure 10A The reusable frame 10200 further includes a stopper 10310, a support 10500, and two flexible sheets 10410 and 10420. (Reference) Figures 10A to 10D and Figure 10H In this example, the plug 10310 is an elongated flexible rope that fits into the frame 10200. The plug can be made of any flexible material, such as vinyl resin, plastic, rubber, foam, composite materials, sponge rope, and combinations thereof. Figure 10H A close-up view of a portion of the plug 10310 is shown. In this example, the plug 10310 has a generally circular cross-section, with multiple plug ridges 10312 (13 ridges in this example) projecting outwards along the length of the plug to provide better grip and compression when the plug is pressed into the plug receiving portion of the frame. The plug 10310 also includes a hollow core along its length to provide greater flexibility and save material costs. In terms of overall diameter and stiffness, the hollow core also serves as a buffer to facilitate easy insertion and removal of the plug from the plug receiving portion.

[0348] refer to Figure 10A , Figure 10B , Figure 10E and Figure 10FThe support member 10500 consists of two pairs of cross members (or scissor grilles) pivotally connected to each other in one direction, each pair of cross members being pivotally connected at a central connection point. The two pairs of cross members are configured to connect the third retainer 10240 and the fourth retainer 10250, such that the third retainer 10240 and the fourth retainer 10250 can be in a spaced-out / assembled position (i.e., ready for use in an assembled state). Figure 10F ) and near / disassembled position (i.e., ready for use in disassembled state) Figure 10E The third and fourth retainers, which are connected and can switch between unfolded and foldable states, make the assembly of the reusable frame easier and therefore more user-friendly. The support 10500 is configured to be fixedly connected to the third retainer 10240 and the fourth retainer 10250.

[0349] Now for reference Figure 10A , Figure 10B and Figure 10G Two flexible sheets 10410 and 10420 are fixedly or reversibly attached to a portion of the top surface of the pleat. These two flexible sheets generally follow the pleat profile and extend outward from a first pleated edge 10130 and a second pleated edge 10210 to form a first pleated edge extension and a second pleated edge extension, respectively. Using the flexible sheets, all pleated edges and sides of the filter can be directly or indirectly held to a reusable frame, preventing air from bypassing or leaking directly from the edges or sides. The flexible sheets also allow the reusable frame and system to be versatile and adaptable to various sizes and applications, and allow for greater dimensional tolerances in the reusable frame and filter during manufacturing.

[0350] Figure 10C , Figure 10D , Figure 10I and Figure 10J The same filter system 10000 is shown in an assembled state. A first retainer, a second retainer, a third retainer, and a fourth retainer are connected together via a frame connector to form a square frame 10200 and a cavity within the frame for receiving a filter 10100, which is attached to flexible sheets 10410 and 10420. (Reference) Figure 10IThe third retainer 10240 includes: an elongated body 10244, generally cuboid, having a hollow region 10241; a raised plug receiving portion 10245 disposed inside the body; and a bottom horizontal plate 10246 extending inwardly from the bottom inner edge of the body 10244. The hollow region 10241 has an I-shaped cross-section with two extending connector receiving portions 10242 and 10243 at its two vertical ends. The two connector receiving portions 10242 and 10243 are sized and shaped to receive a pair of frame connectors, such as 10270D, respectively. The plug receiving portion 10245 includes a ridge 10245A, and is sized and shaped to frictionally restrain the plug within it. In this example, the fourth retainer is structurally similar and will not be repeated here. In summary, by mounting the plug strip to the plug strip receiving portion, the plug strip receiving portions of the third and fourth retainers respectively secure the first and second sides of the filter to the reusable frame.

[0351] Now for reference Figure 10J The second retainer 10220 is structurally similar to the third retainer 10240 because it also includes: an elongated body 10224, generally cuboid, having a hollow region 10221; a raised plug receiving portion 10225 disposed on the inner side of the body; and a bottom horizontal plate 10226 extending inwardly from the bottom inner edge of the body 10224. The hollow region 10221 has an I-shaped cross-section with two extending connector receiving portions 10222 and 10223 at its two vertical ends. The two connector receiving portions 10222 and 10223 are sized and shaped to receive a pair of frame connectors, such as 10270D, respectively. The plug receiving portion 10225 includes a ridge 10225A, and is sized and shaped to frictionally confine the plug within the receiving portion. In this example, the first retainer is structurally similar and will not be repeated here. Because the first and second pleated edges of the filter are respectively attached to the flexible sheet, the flexible sheet can deform and fit into the plug receiving portion 10225 when the plug is installed. In general, by installing the plug to the plug receiving portion, the plug receiving portions of the third and fourth retainers indirectly hold the first and second pleated edges of the filter to the reusable frame, respectively.

[0352] Now for reference Figure 10KThe second retainer 10220 and the fourth retainer 10250 can be reversibly connected via a pair of frame connectors 10270C. The pair of frame connectors 10270C includes an upper frame connector 10271C and a lower frame connector 10272C, each L-shaped frame connector including a connector notch near the end, thereby providing a friction snap-fit ​​engagement between the connector and the retainer.

[0353] Example 10: Reusable filter frame 11200 and system 11000

[0354] Figures 11A to 11D Another example of a reusable filter system 11000 is shown, which is generally similar to the example reusable filter system 10000 in example embodiment 9, but further includes support members 11500. The reusable filter system 11000 includes a reusable frame 11200, two pleated flexible sheets, plug strips 11310, and support members 11500. The two support members 11510 and 11520 are rigid strips with a groove-shaped cross-section and are configured to be reversibly connected to a third retainer 11240 and a fourth retainer 11250. Support members 11500 provide mechanical support for the reusable frame and system to withstand back pressure and prevent deformation, particularly for applications requiring high airflow rates.

[0355] Now for reference Figure 11D and Figure 11E The fourth retainer 11250 is shown to be structurally similar to Example Embodiment 9, but with a pair of cutouts 11251 and 11252 along its length, each cutout angled upwards to form a support receiving portion. Each end of the support 11510 includes a recess 11511 on each side, the size and shape of which are configured to match the support receiving portion formed by the cutouts 11251 and 11252. Thus, the support can be reversibly attached to the retainer.

[0356] Example Implementation 11: Reusable Filter Frame 12200 and System 12000

[0357] Figures 12A to 12FAnother exemplary reusable filter system 12000 is shown, which is generally similar to the example reusable filter system 11000 in example embodiment 10, but the flexible sheet 12400 is configured as a generally flat, one-piece sheet 12400, the size and shape of which are configured to cover the entire under-fold top surface and extend outward from the first folded edge 12130 and the second folded edge 12120 of the filter 12100. The reusable filter system 12000 includes a reusable frame 12200 for the filter 12100, the flexible sheet 12400, two supports 12500 (left support 12510 and right support 12520) and four plug strips 12000. In this example, the flexible sheet 12400 is attached to the entire under-fold top surface of the filter 12100. The flexible sheet 12400 is made of a breathable material (such as plastic extruded mesh, plastic expanded mesh, or nonwoven fabric, nonwoven web, nonwoven fabric, or elastic nonwoven fabric). Using the flexible sheet, all the pleated edges and sides of the filter 12100 can be directly or indirectly secured to the reusable frame, preventing air from bypassing or leaking directly from the edges or sides. Furthermore, because all the pleats are attached to the flexible sheet (at least on one or both sides), the flexible sheet also provides some mechanical support to the filter (i.e., also serves as a support for the reusable frame) and maintains the pleat spacing (i.e., also serves as pleat spacers). The flexible sheet also allows the reusable frame and system to be versatile and adaptable to various sizes and applications, and allows for greater dimensional tolerances in the reusable frame and filter during manufacturing.

[0358] Now for reference Figure 12A and Figure 12D In this example, plugs 12310 are four long, flexible ropes that fit into frame 10200. Alternatively, a single plug can be used. Plugs can be made of any flexible material, such as vinyl resin, plastic, rubber, foam, composite materials, sponge rope, and combinations thereof. Figure 12DA close-up view of a portion of the plug 12310 is shown. In this example, the plug 12310 has a plug body 12320 with a generally circular cross-section, and ten plug ridges 12321 projecting outwards along the length of the plug 12310 to provide better grip and compression when the plug is pressed into the plug receiving portion of the frame. The plug 12310 also includes a hollow core along its length to provide greater flexibility and save material costs. In terms of overall diameter and stiffness, the hollow core also serves as a buffer to facilitate easy insertion and removal of the plug into / from the plug receiving portion. The plug 12310 further includes a plug flap 12340 and a neck portion 12330 that connects the plug body and the plug flap 12340. The neck portion 12330 further includes a recess 12331 on an exposed side. Alternatively, the neck portion 12330 may further include two recesses 12331 on the two exposed sides. Alternatively, the neck portion 12330 may not include any recesses 12331 on the exposed sides.

[0359] refer to Figure 12EThe third retainer 12240 includes: an elongated body 12241, generally cuboid, having a hollow region 12242; a more convex plug receiving portion 12243 disposed inside the body; and a bottom horizontal plate 12244 extending inwardly from the bottom inner edge of the body 12241. The hollow region 12242 has an L-shaped cross-section with two extending connector receiving portions 12242A and 12242B at different relative vertical positions at its upper and lower ends. The two connector receiving portions 12242A and 12242B are sized and shaped to receive a pair of frame connectors, such as 12270, respectively. The plug receiving portion further includes two ridges sized and shaped to match corresponding recesses to confine the plug within the plug receiving portion. The strip receiving portion 12243 includes two ridges 12243A and 12243B, and the dimensions and shape of the strip receiving portion are configured to frictionally restrict the strip body 12320 at the neck portion 12330. In other words, the gap between the two ridges 12243A and 12243B is configured to allow the neck portion 12330 of the strip 12320 to be held in place. The strip receiving portion is configured such that it allows the strip flap 12340 to be positioned just above the filter, thereby allowing the strip flap 12340 to restrict the first side 12140 of the filter 12100. The strip flap 12340 is substantially flush with the top surface of the third retainer 12240. In this example, the fourth retainer is structurally similar and will not be repeated here. In general, by mounting the strip to the strip receiving portion, the strip receiving portions of the third and fourth retainers hold the first and second sides of the filter to a reusable frame, respectively.

[0360] Now for reference Figure 12FThe second retainer 12220 is structurally similar to the third retainer 12240, as the third retainer 12240 also includes: an elongated body 12221 that is generally cuboid, the elongated body having a hollow region 12222; a more convex plug receiving portion 12223 disposed on the inner side of the body; and a bottom horizontal plate 12224 that extends inward from the bottom inner edge of the body 12221. The hollow region 12222 has a capital "L" shaped cross-section, which has two extending connector receiving portions 1222A and 1222B at different relative vertical positions at the upper and lower ends. The two connector receiving portions 1222A and 1222B are sized and shaped to receive a pair of frame connectors, such as 12270, respectively. The plug receiving portion 12223 includes two ridges 12223A and 12223B, and the size and shape of the plug receiving portion are configured to frictionally restrict the plug body 12320 at the neck portion 12330. In other words, the gap between the two ridges 12223A and 12223B is configured to allow the neck portion 12330 of the plug 12340 to be held in place. The plug receiving portion is configured such that it allows the plug flap 12340 to be positioned just above the filter, thereby allowing the plug flap 12340 to restrict the first pleated edge 12130 of the filter 12100. The plug flap 12340 is substantially flush with the top surface of the third retainer 12240. In this example, the first retainer is structurally similar and will not be repeated here. Because the first and second pleated edges of the filter are attached to the flexible sheet 12400, the extended flexible sheet can deform and fit into the plug receiving portion 12320 when the plug is installed. In general, by installing the plug to the plug receiving portion, the plug receiving portions of the first and second retainers indirectly hold the first and second pleated edges of the filter to the reusable frame, respectively. In another example, the example reusable filter system 12000 does not include two supports 12500 (left support 12510 and right support 12520).

[0361] Example Implementation 12: Reusable Filter Frame 13200 and System 13000

[0362] Figures 13A to 13CAnother example of a reusable filter system 13000 is shown, which is generally similar to the example reusable filter system 12000 in example embodiment 11, but the specific structures of the first retainer 13210, the second retainer 13220, the third retainer 13240, and the fourth retainer 13250 (and therefore the reusable frame 13200) are different to suit the filter 13100 which has a greater pleat height. The reusable filter system 13000 includes a reusable frame 13200 for the filter 13100, a flexible sheet 13400, and four plug strips 13310. The four plug strips 13310 have a generally similar structure to... Figure 12D The structure of the plug 12310 is shown. In this example, a flexible sheet 13400 is attached to the pleated top of the entire filter 13100. The flexible sheet 13400 is made of a breathable material (such as plastic extruded mesh, plastic expanded mesh, or nonwoven fabric, nonwoven mesh, nonwoven fabric, or elastic nonwoven fabric). Using the flexible sheet, all the pleated edges and sides of the filter 13100 can be directly or indirectly held to a reusable frame, preventing air from bypassing or leaking directly from the edges or sides. The flexible sheet also allows the reusable frame and system to be versatile and adaptable to a wide range of sizes and applications, and allows for greater dimensional tolerances in the reusable frame and filter during manufacturing.

[0363] refer to Figure 13C The second retainer 13220 includes a flange 13221, a rectangular vertical extension 13222, and a plug receiving portion 13223 connected to each other. The plug receiving portion is positioned above the vertical extension 13222. The flange 13221 includes a frame connector receiving portion 13221A at its upper end. The vertical extension 13222 includes a frame connector receiving portion 13222A at its lower end. The two connector receiving portions 13221A and 13222A are sized and shaped to receive a pair of frame connectors, such as 13270 (e.g.,...). Figure 13A (As shown). The first holder 13210, the third holder 13240 and the fourth holder 13250 are structurally similar to the second holder 13220, and will not be repeated here.

[0364] The plug receiving portion further includes two ridges, the size and shape of which are configured to match corresponding recesses to retain the plug within the plug receiving portion. The plug receiving portion 13223 includes two ridges 13223A and 13223B, and the size and shape of the plug receiving portion are configured to frictionally restrict the plug 13310 at the neck portion (e.g., Figure 13AThe plug body (shown). In other words, the gap between the two ridges 13223A and 13223B is configured to allow the neck portion of the plug 13310 to be held in place. The plug receiving portion is configured such that it allows the plug flaps to be positioned just above the filter, thereby allowing the plug flaps of the plug 13310 to restrict the second pleated edge of the filter 13100. The plug flaps of the plug 13310 are substantially flush with the top surface of the second retainer 13220. In this example, the first retainer 13210, the third retainer 13240, and the fourth retainer 13250 are structurally similar and will not be repeated here. In general, by mounting the plug to the plug receiving portion, the plug receiving portion of the retainer holds all sides and edges of the filter to a reusable frame. This particular structure of the reusable frame is directly applicable to applications such as those in systems like AHUs. In an alternative example, the filter 13100 is a bag filter.

[0365] Example 13: Method for assembling a filter system and a reusable frame

[0366] Now for reference Figure 14A To assemble a reusable filter system as described in any of the example embodiments above, the following steps are included:

[0367] (a) Step 1401: Provide a reusable filter system as described herein, the reusable filter system comprising a reusable frame, at least one flexible sheet, and at least one plug. The reusable frame includes a first retainer, a second retainer, a third retainer, and a fourth retainer, as well as a plurality of frame connectors. All or at least some components of the reusable system can be reused after cleaning. A pleated filter is also provided.

[0368] (b) Step 1402: To partially or completely assemble the reusable frame, the first retainer, the second retainer, the third retainer, and / or the fourth retainer are connected together via the frame connector and at least one flexible sheet is attached to the interchangeable pleated filter. The flexible sheet may be attached to the filter in a fixed or reversible manner.

[0369] (c) Step 1403: Install the interchangeable pleated filter into the reusable frame;

[0370] (d) Step 1404: If the reusable frame in step 1402 is partially assembled, then assemble the reusable frame completely; and

[0371] (e) Step 1405: Install the at least one plug into the plug receiving portion of the reusable frame. The plug can be installed via a plug roller.

[0372] Optionally, at least one pleated spacer is mounted to the reusable frame.

[0373] Optionally, the first retainer, the second retainer, the third retainer, and the fourth retainer can be connected via multiple connectors.

[0374] Optionally, at least one support member is mounted to the reusable frame.

[0375] Now for reference Figure 14B This illustrates another example method for assembling a filter frame and a filter system. To assemble a reusable filter system as described in any of the example embodiments above, the following steps are included:

[0376] (a) Step 1401': Provide a reusable filter system as described herein, the reusable filter system comprising a reusable frame. The reusable frame includes a first retainer, a second retainer, a third retainer, and a fourth retainer, at least one pleated spacer, and optionally multiple frame connectors. All or at least some components of the reusable system can be reused after cleaning. A pleated filter is also provided.

[0377] (b) Step 1402': The reusable frame is partially or completely assembled by connecting the first retainer, the second retainer, the third retainer and / or the fourth retainer together and installing at least one pleated spacer to the reusable frame.

[0378] (c) Step 1403': Install the interchangeable pleated filter onto the reusable frame; and

[0379] (d) Step 1404': If the reusable frame in step 1402' is partially assembled, then assemble the reusable frame completely;

[0380] Optionally, at least one plug is installed to the plug receiving portion of the reusable frame.

[0381] Optionally, for example, prior to step 1403', at least one flexible sheet is attached to an interchangeable pleated filter.

[0382] Optionally, at least one support member is mounted to the reusable frame.

[0383] Optionally, the first retainer, the second retainer, the third retainer, and the fourth retainer can be connected via multiple connectors.

[0384] In some embodiments, all or at least some components of a reusable system are reused after cleaning. Example 14: Transport Packaging Method for Reusable Filter Systems

[0385] Now for reference Figure 15 An example of a transport packaging method for a reusable filter system is shown, the method comprising the following steps:

[0386] (a) Step 1501: Provide a reusable filter system as described in any of the above embodiments in a disassembled state;

[0387] (b) Step 1502: Package the interchangeable pleated filters in a folded state and / or the reusable filter system in a disassembled state, including a first retainer, a second retainer, a third retainer and a fourth retainer (and optionally other components, such as (multiple) plugs, (multiple) flexible sheets, frame connectors and (multiple) pleated spacers), into a combined packaging container or a separate packaging container to form at least one finished package, thereby significantly reducing the space volume of the finished package;

[0388] (c) Step 1503: Deliver the finished package to the location of use; and

[0389] (d) Step 1504: Assemble the interchangeable filter and the reusable filter system for use.

[0390] Now for reference Figure 16 In this embodiment, multiple reusable filter systems 16200 (five in this example) are packaged together in a box 16100, each reusable filter system being assembled and equipped with interchangeable filters.

[0391] refer to Figure 17A In this embodiment, components of the reusable filter system 17200 (such as a reusable frame in a disassembled state (e.g., a first retainer, a second retainer, a third retainer, and a fourth retainer, and a connector), multiple plug strips, optionally multiple flexible sheets, and optionally multiple pleated spacers and multiple supports) are packaged together with multiple interchangeable filters in a package 17100. In some other embodiments, the package 17100 may include only components of the reusable filter system 17200, with or without multiple interchangeable filters, and the multiple interchangeable filters may be packaged separately or additionally in another package. For example, as Figure 17B As shown, five interchangeable filters 17300 (with or without flexible sheets) are packaged in a filter package 17400. In some embodiments, these filter packages 17400 and / or as shown in the diagram... Figure 17ATwo or more of the packages shown in package 17100 can also be further packaged into a larger box. For example, the filter and frame (i.e., the first retainer, the second retainer, the third retainer, and the fourth retainer) can be packaged together in one package. Other combinations and other numbers of packages can also be used.

[0392] For example, a used filter system can be disassembled, cleaned, and reused, and the used filter can be disposed of. The frame can be reused together with a new filter.

[0393] Example 15: Applications of reusable filter systems and frames

[0394] The reusable filter systems and frames described herein have a wide range of applications and uses. In some examples, the reusable filter systems and frames can be used in any air filtration system with minimal or no modifications. In some examples, the air filtration system can be a heating, ventilation, and air conditioning (HVAC) system, an air conditioning and mechanical ventilation (ACMV) system, a central mechanical ventilation and air conditioning (central MVAC) system, a variable refrigerant flow (VRV) or split system, an air handling unit (AHU), a fresh air system (MAU), a fresh air unit (PAU), and / or a fan coil unit (FCU). In some examples, an air filtration method using the reusable filter systems and frames described herein is provided, the method comprising the step of applying the reusable filter system to the air filtration system. In some examples, the air filtration system may be a heating, ventilation and air conditioning (HVAC) system, an air conditioning and mechanical ventilation (ACMV) system, a central mechanical ventilation and air conditioning (central MVAC) system, a variable refrigerant flow (VRV) or split system, an air handling unit (AHU), a fresh air system (MAU), a fresh air unit (PAU), and / or a fan coil unit (FCU).

[0395] Therefore, exemplary embodiments of the invention have been fully described. Although the description relates to specific embodiments, those skilled in the art will understand that the invention can be practiced with variations of these specific details. Therefore, the invention should not be construed as limited to the embodiments set forth herein.

[0396] For example, the connection between each frame connector and the retainer can be secured by one or more coupling mechanisms, such as snap-fit ​​mechanisms, magnetic mechanisms, interlocking mechanisms, etc. For example, each frame connector includes two clips on each arm for snap-fit ​​engagement with corresponding ribs on the retainer to secure the connection between the frame connector and the retainer.

[0397] For example, in some exemplary embodiments, the pleated spacer is a rigid, serrated wire, but various shapes (e.g., M-shaped), forms (e.g., rods, strips, or plates), stiffnesses, and materials can also be used.

[0398] For example, in some embodiments, the support members are two pairs of cross members that are pivotally connected to each other in one direction, but other pairs of cross members, such as one, two, three or more, may also be used.

[0399] For example, in some exemplary embodiments, the plug is shown as a square shape that fits the frame; however, it should be understood that the plug may be formed from one continuous or multiple discontinuous elongated flexible ropes.

[0400] For example, the frame connector can be connected to the retainer using other reversible mechanisms, such as slot type, snap type, magnetic type, or interlocking type.

[0401] For example, in some embodiments, the filter is a pleated filter with multiple pleats that are generally equidistant, but other types of filters, such as flat (non-pleated) filters or bag filters, may also be used.

Claims

1. A reusable filter system, comprising: (a) An interchangeable filter having a plurality of pleats, each pleat having a pleat height, a pleat width and a cross section defining a pleat profile, the filter having a first pleat edge and an opposing second pleat edge generally perpendicular to the pleating direction, a first side edge and an opposing second side edge generally parallel to the pleating direction, and an upper pleat top surface and an opposing lower pleat top surface. as well as (b) A reusable framework, said reusable framework comprising: (i) A first retainer, the size and shape of which are configured to retain the plurality of pleats along the first pleated edge; (ii) A second retainer, the size and shape of which are configured to retain the plurality of pleats along the second pleated edge; (iii) a third retainer, the third retainer being sized and shaped to retain the plurality of pleats along the first side; and (iv) A fourth retainer, the fourth retainer being sized and shaped to retain the plurality of folds along the second side; (v) At least one pleated spacer, said at least one pleated spacer being connectable to the frame; (c) At least one support member connected to the reusable frame; the at least one support member is one or more pairs of cross members pivotally connected to each other in one direction, each pair of cross members being pivotally connected at a central connection point, wherein the one or more pairs of cross members are configured to connect the third retainer and the fourth retainer such that the first retainer and the second retainer can be switched between an assembled position and a disassembled position; The first retainer, the second retainer, the third retainer, and the fourth retainer include a disassembled state and an assembled state; wherein, in the disassembled state, the first retainer, the second retainer, the third retainer, and the fourth retainer are separated from each other and packaged into one or more packaging containers; In the assembled state, the first retainer, the second retainer, the third retainer, and the fourth retainer are reversibly connected to each other to form the reusable frame, which has a cavity to receive the filter when the system is in the assembled state. The at least one pleated spacer is detachably connected to the third and fourth retainers; each of the at least one pleated spacer includes a plurality of spacer elements whose size and shape are configured to match the plurality of pleats, thereby maintaining the spaced pleat profile of the filter when the system is in the assembled state. (d) At least one stopper strip, Each of the first retainer, the second retainer, the third retainer, and the fourth retainer further includes a plug receiving portion, the plug receiving portion being sized and shaped to receive the plug; and (f) At least one flexible sheet, the at least one flexible sheet comprising a first flexible sheet and a second flexible sheet; the at least one flexible sheet is configured to be fixedly attached to the filter by adhesive, thermal bonding and / or ultrasonic welding to at least a portion of the filter being attached to the upper top surface of the fold and / or the lower top surface of the fold; the first flexible sheet is sized and shaped to cover the entire upper top surface of the fold or the entire lower top surface of the fold and extends outward from the first fold edge to form a first fold edge extension, and the second flexible sheet is sized and shaped to cover the entire upper top surface of the fold or the entire lower top surface of the fold and extends outward from the second fold edge to form a second fold edge extension; When the at least one plug is installed in the plug receiving portion, the plug receiving portions of each of the first retainer, the second retainer, the third retainer, and the fourth retainer are respectively able to frictionally secure the first pleated edge extension, the second pleated edge extension, the first side, and the second side in the plug receiving portion, preventing air from bypassing or leaking directly from the edge or side.

2. The reusable filter system as claimed in claim 1, wherein, The number of spacers generally matches the number of pleats, and each spacer has a spacer width generally matching the width of the pleats.

3. The reusable filter system as described in claim 1 or 2, wherein, The at least one pleat spacer is provided in the form of a spring that can be connected to the third and fourth retainers, and the plurality of spacer elements are provided in the form of a plurality of spring coils, each spring coil being sized and shaped to match the pleat width.

4. The reusable filter system as described in claim 1 or 2, wherein, The at least one fold spacer is provided in the form of a serrated member that generally follows at least a portion of the fold profile.

5. The reusable filter system as claimed in claim 1, wherein, The first retainer includes a first plate and a plurality of spaced-apart first teeth extending vertically from the longitudinal side of the first plate; and / or The second retainer includes a second plate and a plurality of spaced-apart second teeth extending vertically from the longitudinal side of the second plate. The spacing between two adjacent first teeth and / or second teeth is configured to match the corresponding fold width, and the tooth height is configured to match the corresponding fold height, thereby maintaining a spaced fold profile along the first side and / or the second side.

6. The reusable filter system as described in claim 1 or 2, wherein, The pleat spacer includes a spacer plate and a plurality of spacer teeth extending perpendicularly from the longitudinal side of the spacer plate, wherein the spacing between two adjacent spacer teeth is configured to match the corresponding pleat width, and the tooth height is configured to match the corresponding pleat height.

7. The reusable filter system as described in claim 1, wherein, The at least one pleated spacer is configured to be connected to the third retainer and the fourth retainer.

8. The reusable filter system of claim 1, wherein, The at least one flexible sheet is at least partially breathable.

9. The reusable filter system of claim 1, wherein, The at least one flexible sheet is a continuous sheet, the size and shape of which are configured to cover the entire upper top surface of the fold or the entire lower top surface of the fold and extend outward from the first fold edge and the second fold edge.

10. The reusable filter system as described in claim 1, wherein, When the system is in the assembled state, all the plug receiving portions together form a continuous plug channel for receiving plugs.

11. The reusable filter system as described in claim 1, wherein, Each plug receiving portion further includes at least one ridge to frictionally confine the plug within the plug receiving portion.

12. The reusable filter system as described in claim 1, wherein, The plug further includes a plug flap that extends along the longitudinal length of the plug to confine the first pleated edge, the second pleated edge, the first side and / or the second side within the frame when the system is in the assembled state.

13. The reusable filter system of claim 12, wherein, The plug further includes a neck portion that connects the plug and the plug flap.

14. The reusable filter system of claim 13, wherein, The neck portion further includes at least one recess, and the plug receiving portion further includes at least one ridge, the size and shape of which are configured to mate with the corresponding recess to hold the plug in the plug receiving portion.

15. The reusable filter system as described in claim 1, wherein, The reusable frame further includes a plurality of connectors, each connector being configured to reversibly connect the two ends of any two of the first retainer, the second retainer, the third retainer, and the fourth retainer together.

16. The reusable filter system of claim 1, wherein, The at least one support member is a rigid rod having a rectangular, slotted, or trapezoidal cross-section.

17. A reusable frame for an interchangeable, pleated filter, the filter having a plurality of pleats, each pleat having a pleat height, a pleat width, and a cross section defining a pleat profile, the filter having a first pleated edge and an opposing second pleated edge generally perpendicular to the pleating direction, a first side and an opposing second side generally parallel to the pleating direction, and an upper pleat top face and an opposing lower pleat top face, the filter further comprising at least one flexible sheet, the at least one flexible sheet comprising a first flexible sheet and a second flexible sheet; the at least one flexible sheet being configured to be fixedly attached to the filter by adhesive, thermal bonding, and / or ultrasonic welding to at least a portion of the upper pleat top face and / or the lower pleat top face; the first flexible sheet being sized and shaped to cover the entire upper pleat top face or the entire lower pleat top face and extending outward from the first pleated edge to form a first pleated edge extension, and the second flexible sheet being sized and shaped to cover the entire upper pleat top face or the entire lower pleat top face and extending outward from the second pleated edge to form a second pleated edge extension; The reusable framework includes: (i) A first retainer, the size and shape of which are configured to retain the plurality of pleats along the first pleated edge; (ii) A second retainer, the size and shape of which are configured to retain the plurality of pleats along the second pleated edge; (iii) A third retainer, the size and shape of which are configured to retain the plurality of folds along the first side; (iv) A fourth retainer, the fourth retainer being sized and shaped to retain the plurality of folds along the second side; (v) At least one pleated spacer, which can be connected to the frame; as well as At least one support member is connected to the reusable frame; the at least one support member is one or more pairs of cross members pivotally connected to each other in one direction, each pair of cross members being pivotally connected at a central connection point, wherein the one or more pairs of cross members are configured to connect the third retainer and the fourth retainer, such that the first retainer and the second retainer can be switched between an assembled position and a disassembled position; The plug strip corresponding to the retainer; The first, second, third, and fourth retainers are configured to be reversibly connected to each other to form the reusable frame, which has a cavity to receive the filter when the reusable frame is in an assembled state. Each of the at least one pleated spacer includes a plurality of spacer elements, the size and shape of which are configured to match the plurality of pleats, thereby maintaining the spaced pleat profile of the filter when the reusable frame is in the assembled state; Each of the first retainer, the second retainer, the third retainer, and the fourth retainer further includes a plug receiving portion, the plug receiving portion being sized and shaped to receive a plug, wherein when the reusable frame is in the assembled state, all the plug receiving portions together form a continuous channel for receiving the plug; When the plug is installed in the plug receiving portion, the plug receiving portions of each of the first retainer, the second retainer, the third retainer and the fourth retainer are respectively able to frictionally fix the first pleated edge extension, the second pleated edge extension, the first side and the second side in the plug receiving portion, preventing air from bypassing or leaking directly from the edge or side.

18. The reusable frame as described in claim 17, wherein, The plug further includes a plug flap extending along the longitudinal length of the plug to confine the first pleated edge, the second pleated edge, the first side and / or the second side within the frame when the reusable frame is in the assembled state; the plug further includes a neck portion connecting the plug and the plug flap; and each plug receiving portion further includes at least one ridge to frictionally confine the plug within the plug receiving portion.

19. The reusable frame as described in claim 18, wherein, The neck portion further includes at least one recess, and the plug receiving portion further includes at least one ridge, the size and shape of which are configured to mate with the corresponding recess to hold the plug in the plug receiving portion.

20. The reusable frame as described in claim 17, wherein, The number of spacers generally matches the number of pleats, and each spacer has a spacer width generally matching the width of the pleats.

21. The reusable frame as described in claim 17, wherein, The at least one pleat spacer is provided in the form of a spring that can be connected to the third and fourth retainers, and the plurality of spacer elements are provided in the form of a plurality of spring coils, each spring coil being sized and shaped to match the pleat width.

22. The reusable frame as described in claim 17, wherein, The at least one fold spacer is provided in the form of a serrated member that generally follows at least a portion of the fold profile.

23. The reusable frame as described in claim 17, wherein, The first retainer includes a pair of first clamping members, each having an engagement surface that is complementary to each other, the shape of the engagement surfaces generally matching the fold profile along the first folded edge; and The second retainer includes a pair of second clamping members, each having an engagement surface that is complementary to each other, the shape of which generally matches the fold profile along the second folded edge. Such that when the reusable frame is in the assembled state, the filter is clamped between the first clamp and the second clamp along at least a portion of the first pleated edge and the second pleated edge.

24. The reusable frame as described in claim 17, wherein, The first retainer includes a first plate and a plurality of spaced-apart first teeth extending vertically from the longitudinal side of the first plate; and / or The second retainer includes a second plate and a plurality of spaced-apart second teeth extending vertically from the longitudinal side of the second plate. The spacing between two adjacent first teeth and / or second teeth is configured to match the corresponding fold width, and the tooth height is configured to match the corresponding fold height, thereby maintaining a spaced fold profile along the first side and / or the second side.

25. The reusable frame as described in claim 17, wherein, The pleat spacer includes a spacer plate and a plurality of spacer teeth extending perpendicularly from the longitudinal side of the spacer plate, wherein the spacing between two adjacent spacer teeth is configured to match the corresponding pleat width, and the tooth height is configured to match the corresponding pleat height.

26. The reusable frame as described in claim 17, wherein, The at least one pleated spacer is configured to be connected to the third retainer and the fourth retainer.

27. The reusable frame as described in claim 17, wherein, The reusable frame further includes a plurality of connectors, each connector being configured to reversibly connect the two ends of any two of the first retainer, the second retainer, the third retainer, and the fourth retainer together.

28. The reusable frame as described in claim 17, wherein, The at least one support member is a rigid rod having a rectangular, slotted, or trapezoidal cross-section.

29. A method of assembling a reusable filter system for interchangeable pleated filters, the method comprising the steps of: (a) Providing a reusable filter system as claimed in any one of claims 1 to 16, the reusable filter system comprising a reusable frame; (b) Connecting the third and fourth retainers by linking the first, second, third, and fourth retainers together and mounting at least one pleated spacer to the reusable frame, and by mounting at least one pair of supports between the third and fourth retainers; (c) Installing the interchangeable pleated filter into the reusable frame; and (d) If the reusable frame is partially assembled, then assemble the reusable frame completely. At least one plug is installed into the plug receiving portion of the reusable frame, and at least one flexible sheet is attached to the interchangeable pleated filter.

30. The method of claim 29, wherein, Step (b) further includes: The first retainer, the second retainer, the third retainer, and the fourth retainer are connected by multiple connectors.

31. A method for transporting a reusable filter system, the method comprising the steps of: (a) Providing a reusable filter system in a disassembled state as described in any one of claims 1 to 16; (b) Packaging the interchangeable pleated filters in a folded state and / or the reusable filter system in a disassembled state into one or more packaging containers to form at least one finished package. This results in a significant reduction in the spatial volume of the finished packaging; (c) Delivering the finished package to the location of use; and (d) Assemble the reusable filter system for use.

32. Use of the reusable filter system as described in claim 31 in an air filtration system.

33. The use as described in claim 32, wherein, The air filtration system is one or more systems selected from the group consisting of: heating, ventilation and air conditioning (HVAC) systems, air conditioning and mechanical ventilation (ACMV) systems, central mechanical ventilation and air conditioning (central MVAC) systems, variable refrigerant flow (VRV) or split systems, air handling units (AHU), fresh air systems (MAU), fresh air units (PAU), and fan coil units (FCU).

34. An air filtration method using a reusable filter system according to any one of claims 1 to 16, the method comprising the step of applying the reusable filter system to an air filtration system.

35. The method of claim 34, wherein, The air filtration system is one or more systems selected from the group consisting of: heating, ventilation and air conditioning (HVAC) systems, air conditioning and mechanical ventilation (ACMV) systems, central mechanical ventilation and air conditioning (central MVAC) systems, variable refrigerant flow (VRV) or split systems, air handling units (AHU), fresh air systems (MAU), fresh air units (PAU), and fan coil units (FCU).

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