Air filter and gasket for air filter

Abstract

Disclosed herein are replaceable filter frame gaskets and air filters having replaceable filter frame gaskets. The gaskets are resiliently secured to the filter frame of the air filter, thereby making the gaskets easily reusable and removable from the air filter.

Description

Technical Field

[0001] The embodiments described herein relate to an air handling system utilizing an air filter. More specifically, the embodiments described herein relate to an air filter liner for such an air filter. Background Technology

[0002] Air filtration systems typically utilize a combination of pre-air filters and main air filters mounted on a retaining frame assembly attached to the air processor or air duct of an air handling system. The final air filter and pre-filter are configured to remove particles from the airflow passing through the air handling system (e.g., heating, ventilation, and air conditioning systems).

[0003] Each of the pre-air filter and the main air filter includes a filter frame in which the filter media is typically encapsulated with adhesive. The filter media can be configured as a pleated panel, micropleat, bag filter, or arranged in a V-shaped group of pleated panels assembled in a common filter frame. This V-shaped group air filter is typically used in air filtration applications requiring large amounts of filter media, particularly in high-flow, low-pressure-drop applications. Panel air filters can be used as pre-filters or in air filtration applications where large amounts of filter media are not required. The adhesive securing the filter media to the filter frame prevents airflow between the filter media and the filter frame, improving particulate removal by reducing or removing the amount of air bypassing the filter media in the air filter. In many applications requiring high filtration efficiency, a gasket is placed between the filter frame of the air filter and the retaining frame assembly of the air filtration system in which the air filter is mounted. The gasket prevents airflow between the air filter and the retaining frame assembly, improving particulate removal by reducing or removing the amount of air bypassing the air filter.

[0004] Conventionally, the gasket is permanently attached to the filter frame. The gasket can be placed in place on the filter frame, secured to the filter frame with pressure-sensitive adhesive, molded into the filter frame, extruded with the filter frame, or otherwise permanently adhered to the filter frame, making it necessary to replace either the air filter or the gasket, which necessitates replacing the entire air filter or the filter frame for another application of adhesive, with the gasket to be scraped off. On the one hand, the lifespan of an air filter is typically much shorter than that of the gasket. On the other hand, the gasket may be damaged before the air filter reaches the end of its lifespan. In either case, when only the filter media or the gasket needs replacement, the entire air filter must be replaced, thus increasing the ownership and operating costs of the air filtration system. Another solution that can be used is to permanently adhere the gasket to the retaining frame. This solution will suffer from the same disadvantages as those discussed above for permanently adhering the gasket to the filter. It may even be a more unfavorable solution because the removal of the gasket will then have to be done on-site, often in a hard-to-access location.

[0005] Therefore, an improved air filter and a gasket for the air filter are needed. Summary of the Invention

[0006] Several embodiments of an air filter are disclosed herein, the air filter having a filter frame and a separate filter frame gasket. The gasket has a rectangular annular body having an inner perimeter, an outer perimeter, and corners. A flange extends outwardly from a first surface of the body that extends continuously along the entire length of the body. The gasket also has a mating portion extending from a second surface of the body that extends continuously along the entire length of the body.

[0007] In another embodiment, a filter frame gasket is disclosed. The filter frame gasket has a rectangular annular body. The rectangular annular body has an inner perimeter, an outer perimeter, and corners, wherein the corners are uniformly and completely formed without seams or welds. A first flange extends outwardly from the outer perimeter, which extends continuously along the entire length of the body.

[0008] Other embodiments include an air filter. The air filter includes: a filter frame that holds filter media within its interior; and a gasket that is resiliently fixed to the exterior of the filter frame. In one example, the filter frame has a body. The body may be manufactured as a single, continuous piece of material, or may be assembled from separate components. The body has multiple walls coupled together to form a rectangular ring with corners. The walls have an upstream surface, a downstream surface, an outer perimeter, and an inner perimeter. The filter media is disposed within the ring of the body and is sealed very close to or against the inner perimeter of the walls. A gasket of a single-piece configuration is continuously arranged around the multiple walls. Alternatively, the gasket may have a seam where the ends are joined to form a ring. The gasket has a rectangular annular body. The gasket is secured to the filter frame by the resilient compression of the stretched annular body and / or by compression of the body's contour within a receiving feature of the filter frame. The rectangular annular body has an inner perimeter, an outer perimeter, and corners. The flange extends outward from a first surface that extends continuously along the entire length of the body, and extends from the outer perimeter of the filter frame and has a flange corner that is uniformly and completely formed without seams or welds. Attached Figure Description

[0009] To gain a more detailed understanding of the above-described features of the invention, a more specific description of the invention, which has been briefly outlined above, can be obtained by referring to the embodiments, some of which are illustrated in the accompanying drawings. However, it should be noted that the drawings merely illustrate typical embodiments of the invention and should not be construed as limiting the scope of protection of the invention, as the invention may allow for other equally effective embodiments.

[0010] Figure 1 This is a schematic cross-sectional view of an air processor with a retaining frame assembly according to an embodiment of the present invention, the air processor including at least one air filter mounted therein, wherein one or more air filters are mounted within the retaining frame.

[0011] Figures 2A to 2B Depicting Figure 1 Perspective and front view of the retaining frame.

[0012] Figure 3A This is a plan view of the upstream side of an air filter with a removable liner.

[0013] Figure 3B yes Figure 3A Plan view of the downstream side of the air filter.

[0014] Figure 3C yes Figure 3A A top view of the padding.

[0015] Figure 3D Is with Figure 3A The image depicts a perspective view of the filter frame of an air filter connected to a liner.

[0016] Figure 4A It shows Figure 3A A partial cross-sectional profile of the interface between the air filter liner and the filter frame, as shown in the first example.

[0017] Figure 4B It shows Figure 3A A partial cross-sectional profile of the interface between the air filter liner and the filter frame, as shown in the second example.

[0018] Figure 4C It shows Figure 3A A partial cross-sectional profile of the interface between the air filter liner and the filter frame, as shown in the third example.

[0019] Figure 4D It shows Figure 3A A partial cross-sectional profile of the fourth example of the interface between the air filter liner and the filter frame.

[0020] Figure 4E It shows Figure 3A The fifth example shows a partial cross-sectional profile of the interface between the air filter liner and the filter frame.

[0021] Figure 4F It shows Figure 3A The sixth example shows a partial cross-sectional profile of the interface between the air filter liner and the filter frame.

[0022] Figure 5A It is a partial cross-sectional profile of an air filter having a removable liner extending around the perimeter of a filter frame surrounding the air filter.

[0023] Figure 5B It is used for Figure 5A A perspective view of an exemplary corner configuration of the outer ribs of the padding.

[0024] Figure 5C It is used for Figure 5A A perspective view of another exemplary corner configuration of the outer rib of the padding.

[0025] Figure 6A This is a partial perspective view of an air filter, another example of which has a liner extending around the perimeter of the filter frame surrounding the air filter.

[0026] Figure 6B yes Figure 6A A partial cross-sectional view of the liner shown.

[0027] Figure 7 yes Figure 6A A cross-sectional view of another example of the pad shown.

[0028] Figure 8A yes Figure 4F A top view of a portion of another example of the padding shown.

[0029] Figure 8B yes Figure 8A The pad shown is a bottom perspective view.

[0030] Figure 8C yes Figure 8A Top perspective view of the padding.

[0031] For ease of understanding, the same reference numerals are used to indicate common elements in the figures, where possible. It is contemplated that elements of one embodiment may be advantageously incorporated into other embodiments without further explanation. Detailed Implementation

[0032] Embodiments of the present invention generally provide a removable gasket that mates with an air filter or retaining frame, the removable gasket having a sealing function facing outwards or inwards, respectively. In one embodiment, an air filter with a removable gasket is provided. The air filter can be configured as a pre-filter, main filter, bag filter, V-bank filter, or canister filter, and other types of filter configurations. The gasket is resiliently secured to the exterior of the filter frame of the air filter. The gasket is annular. The gasket can be manufactured as a single, continuous, one-piece material, or may have a single seam. The gasket is secured to the filter frame by the resilient compression of the stretched annular body and / or by compression of the body's contour within the receiving features of the filter frame. The filter frame holds the filter media within the air filter. In many applications, the air filter is mounted in a retaining frame assembly during use. This retaining frame assembly is attached to a housing for an air handler or other air movement conduit. The gasket disposed on the filter frame has one or both of the following functions: the gasket retains the air filter within the retaining frame; and / or, the gasket provides a partial seal between the filter frame and the retaining frame assembly. In one example, the gasket is molded, co-molded, or otherwise formed as a single continuous sheet of material to prevent the appearance of gaps, seams, openings, or other irregularities that would compromise the seal along the entire perimeter formed by the gasket between the filter frames when the filter frame is disposed in the retaining frame assembly. The gasket is independent of the filter frame and removable from the filter frame to allow for independent reuse and replacement of the gasket or the filter. In one or more examples, the corners of the gasket are shaped to fit into the space formed at the intersection of the corners of the filter frame and the retaining frame assembly to prevent the appearance of gaps that air could bypass or leak through the air filter when the housing is disposed. The gasket seals and holds the filter frame in a sealed position within the retaining frame assembly, ideally eliminating the need for fasteners or other devices to hold the air filter within the retaining frame assembly in many applications. Different embodiments of the gasket are described below, with various gasket profiles and their advantages discussed. Furthermore, examples of the gasket provide different placements of the gasket on the filter frame.

[0033] For clarity, the retaining frame assembly and the filter frame are separate and distinct components. The retaining frame assembly is part of the air processor permanently installed in the facility and is not part of the air filter. Once installed in the facility, the retaining frame becomes a permanent part of the air processor. Conversely, the filter frame is part of the air filter, which is manufactured, shipped, and sold as a separate unit from the retaining frame assembly. The filter frame is the portion of the air filter that contacts the retaining frame assembly when the air filter is removably installed within it. Although some filter frames have removable filter media elements, once installed, such filter frames still comprise the air filter itself and are not part of the facility.

[0034] Furthermore, although the adjective “air” is used to describe the filters and filtration devices disclosed herein, “air” is intended to refer to any major gaseous fluid, such as combustion gases that are not typically described as “air”.

[0035] Figure 1 This is a schematic cross-sectional view of an air processor 100 having a retaining frame assembly 102 mounted therein, according to an embodiment of the invention. Although the retaining frame assembly 102 is shown as being mounted inside the air processor 100, it is contemplated that the retaining frame assembly 102 can be advantageously used in or associated with other air movement ducts and conduits. While it is contemplated that the retaining frame assembly 102 can be mounted in the air processor 100, it should be understood that the retaining frame assembly 102 can be external to the air processor 100. For example, a filter retaining frame may be present on the exterior of a building associated with a building's air intake, while a fan may be on the opposite side of the building.

[0036] For simplicity, this disclosure will discuss an air processor 100, which generally includes a housing 104 that houses a blower 106 and a retaining frame assembly 102; a filter assembly 108 having one or more main air filters 110 and one or more pre-filters 160 (shown in dashed lines) optionally removably mounted to the retaining frame assembly 102. The housing 104 may include an inlet / outlet door 122 for facilitating replacement of the main air filters 110 and / or the pre-filters 160. The blower 106 draws air into the housing 104 through a grille 112 and through the filter assembly 108, thereby discharging filtered air from the housing 104 into a duct 114. The filtered air exiting the air processor 100 via the duct 114 is typically delivered to a facility or other location. Although the blower 106 is shown downstream of the retaining frame assembly 102, alternatively, the blower 106 may be positioned upstream.

[0037] The retaining frame assembly 102 is hermetically coupled to the housing 104 and supports one or more main air filters 110 and optional pre-filters 160 included in the filter assembly 108. The retaining frame assembly 102 may be sealed to the housing 104 by welding, caulking, gasketing, or other suitable methods. Generally, the retaining frame assembly 102 includes one or more retaining frames 116. Each retaining frame 116 has a central aperture 118 and is configured to removably retain a single main air filter 110 and / or associated pre-filter 160. The retaining frames 116 are fastened, welded, or otherwise permanently attached to each other such that the plurality of retaining frames 116 permanently constitute part of the filter retaining frame assembly 102, and thus permanently constitute part of the housing 104 of the air processor 100.

[0038] The main air filter 110 can be configured as a bag filter, V-shaped filter, canister filter, pleated flat panel filter, cartridge filter, and other types of filter configurations. Although the gasket described below is used with the main air filter 110, the pre-filter 160 can be similarly configured with a gasket for the same purpose in the same manner. The main air filter 110 includes filter media 190 disposed within a filter frame 180. Filter media 190 can be a particulate filter and / or a molecular phase (i.e., chemical) filter. In one example, filter media 190 has a Minimum Efficiency Reported Value (MERV) rating of 7 or higher. Filter media 190 can be pleated to increase the surface area available for air passage and increase the filtration efficiency of the filter element. For example, filter media 190 is pleated and has a MERV rating of 7 or higher. In another example, filter media 190 is a carbon-based chemical filter media. Filter media 190 is directly fixed within the filter frame 180 of the main air filter 110. The filter media 190 can be trapped within the geometry of the filter frame 180 during assembly and / or secured by an adhesive (such as polyurethane) to provide an air seal between the filter media 190 and the filter frame. The filter frame 180 includes four sides that close open passages in which the filter media 190 is secured. The sides of the filter frame 180 may have a C-shaped profile that receives the edges of the filter media 190 and may be made of aluminum, sheet metal, plastic, paper (meaning including paper-like products), wood, or other suitable materials. Figure 1In the embodiments depicted herein, the filter media has a quadrilateral planar form. In alternative embodiments, multiple or a single filter media element may have a single or multiple V-shapes and be arranged in a single filter frame 180 to form a V-shaped group air filter known in the air filtration industry. In the embodiments described herein, the air filter may refer to the main air filter 110 or the pre-filter 160.

[0039] In one embodiment, the main air filter 110 may be one of the following: an ASHRAE-rated or Minimum Efficiency Reporting Value (MERV) rated filter, a 95% DOP filter, a HEPA filter, or a filter with other efficiencies. Other examples of the main air filter 110 that may be used with embodiments of the invention include, but are not limited to, 1" deep panel or pleated filters, 2" deep panel or pleated filters, 4" deep panel or pleated filters, 6" or 12" deep rigid filters, overhead rigid or bag filters, and V-group filters, as well as other filters. In one embodiment, the pre-filter 160 may be an ASHRAE-rated, MERV-rated, EN779-rated, ISO-rated, or other suitable primary filter.

[0040] Figure 2A and Figure 2BPerspective and front plan views of a retaining frame 116 according to an embodiment of the invention are depicted. The retaining frame 116 includes four I-shaped walls, such as a top wall 202, two side walls 204, and a bottom wall 206, coupled to form a rectangular ring defining a central aperture 118. In one embodiment, the top wall 202, side walls 204, 208, and bottom wall 206 are sufficiently spaced to receive a main air filter 110 between them. The walls 202, 204, 206, 208 also include rear flanges 216, 226, 236, 246, which extend 90 degrees inward from the plane of the walls 202, 204, 206, 208 and terminate at open edges 212, 222, 232, 242 defining the central aperture 118 of the retaining frame 116. Walls 202, 204, 206, 208 and rear flanges 216, 226, 236, 246 can be manufactured from single or multiple components. Rear flanges 216, 226, 236, 246 provide surfaces abutting the main air filter 110 when mounted into the retaining frame 110, while the size of the orifice 118 defined by open edges 212, 222, 232, 242 is determined to prevent the filter 110 from passing through the retaining frame 116 without interrupting airflow through the air filter 110. It should be noted that angles other than 90 degrees between the walls and rear flanges can be used, and the walls and rear flanges can have slightly different shapes, as long as they form a sealable and reliable mount for the air filter. Furthermore, it should be understood that the air filter 110 can be arranged on the upstream or downstream surface of the rear flanges 216, 226, 236, 246.

[0041] For clarity, relative to airflow (e.g., such as...) Figure 1 The embodiments of the invention are described in terms of the direction of the airflow shown. Further, the terms "upstream" and "downstream" may be used herein to describe the arrangement and configuration of components of embodiments of the invention relative to such a directional airflow (e.g., "downstream side"). However, it is contemplated that embodiments of the invention may be configured for use with the airflow in the "opposite" or opposite direction. Therefore, it should be understood that such terms as "downstream" or "upstream" do not in any way limit or constrain the embodiments of the invention or the manner in which embodiments of the invention may be utilized, but rather provide clarification regarding the arrangement and configuration of the components relative to an exemplary direction of the airflow.

[0042] Figures 3A to 3DAir filters with replaceable gaskets 300, such as the main air filter 110 and other air filters, are described in detail. For example, the gasket 300 can be attached independently to the filter frame 110. The gasket 300 can be glued, overmolded, or otherwise attached to the filter frame 110 in a semi-permanent or permanent manner. Alternatively, the gasket 300 can be attached to the filter frame 110 in a resilient manner or by utilizing attachment features that allow removal of the gasket 300 from the filter frame 100. For example, a damaged gasket 300 can be removed from the filter frame and replaced with a new gasket 300. The filter frame 110 is rectangular and can have a length on either side between approximately 300 mm and approximately 610 mm, and even exceeding approximately 1200 mm. For example, the filter frame 110 can be approximately 300 mm by approximately 300 mm, approximately 1 foot by approximately 1 foot, approximately 1 foot by approximately 2 feet, approximately 2 feet by approximately 2 feet, or even approximately 4 feet by approximately 4 feet. However, it should be understood that the filter frame 110 can be any suitable large size for an air handling system. In the following text, the main air filter 110 is referred to as air filter 110. For clarity, each figure will be described independently. Figure 3A This is a plan view showing the upstream side of the air filter 110, including the filter frame 180 and filter media 190. Note that the air filter 110 is relative to... Figure 1 The diagram is oriented at 90 degrees. The filter frame 180 has a body 117. The wall 304 of the body 117 has an inner surface 341 and an outer perimeter 342. The wall 304 of the body 117 may have four walls, such as a first wall 381, a second wall 382, ​​a third wall 383, and a fourth wall 384. The walls 304 of the body 117 meet at corresponding outermost corners 349 along the outer perimeter 342 of the body 117. The outermost corners 349 define the outermost extension of the filter frame 180. In some examples, the filter frame 180 has a recess 310 arranged at the outermost corner 349.

[0043] Figure 3B yes Figure 3A A top view of the air filter 110. See also Figure 3A and Figure 3BBoth, the body 117 of the filter frame 180 additionally has a downstream surface 321 and an upstream surface 322. Filter media 190 is disposed between the upstream surface 322 and the downstream surface 321. A gasket 300 is removably disposed on the filter frame 180. Removable disposal means that the gasket 300 is fixed to the filter frame 180 without the use of adhesive. Specifically, the gasket 300 is elastically fixed to the filter frame 180. Elastic fixation means that the gasket 300 is fixed to the retaining portion by elastic compression of the gasket 300's contour and / or by annular compression of the gasket 300 stretched around the perimeter of the filter frame 180. The gasket 300 may be disposed on the downstream surface 321 or around the outer perimeter 342 of the filter frame 180. When installed, the perimeter of the gasket 300 is larger than the perimeter of the filter frame 180. The gasket 300 has an outer edge 343 extending beyond the outer perimeter 342 of the body 117 of the filter frame 180. In this manner, the gasket 300 forms a seal between the filter frame 180 of the air filter 110 and the retaining frame 116 of the retaining frame assembly 102. Therefore, when the air filter 110 is installed in the retaining frame 116, air passes through the filter medium 190 of the air filter 110, rather than bypassing the air filter 110 through the gap formed between the air filter 110 and the retaining frame 116.

[0044] Figure 3C A top view shows an example of a gasket 300 suitable for use with a filter frame 180 of an air filter 110. The gasket 300 can be configured in several different profiles, as shown below. Figures 4A to 4F , Figures 5A to 5C , Figures 6A to 6B And other places Figure 7 Some of these contours are described. The liner 300 has a top surface 351, an outer perimeter 343, an inner perimeter 345, and a bottom surface (in...). Figure 3D (As shown by reference numeral 352 in the figures). When mounted to the filter frame 180, the inner perimeter 345 faces the filter media 190, while the outer perimeter 343 extends beyond the outer perimeter 342 of the retaining frame 116. In one example, the inner perimeter 345 of the gasket 300 is at least 1200 mm. The gasket 300 is formed of an elastic material. Suitable elastic materials include high-density foam rubber and similar materials. In another example, the gasket 300 is formed of an elastic material that allows the inner perimeter 345 of the gasket 300 to expand to at least 1200 mm.

[0045] Figure 3D This is a perspective view of an example of the interface between the gasket 300 of the air filter 110 and the filter frame 180. The filter media 190 is not in... Figure 3DThe gasket 300 is shown in the figure, but is present and surrounded by the filter frame 180 of the air filter 110. In some examples, the gasket 300 has a mating portion 353 along its bottom surface 352. The mating portion 353 extends around the entire perimeter of the gasket 300. The mating portion 353 has an inner wall, an outer wall, and a bottom. The gasket 300 also has corners 370, where each side converges to form a rectangular ring shape of the gasket 300. The corner 370 is shown as a line in the figure, where the top surface 351 of the gasket 300 changes direction to follow the wall 304 of the filter frame 180. However, it should be understood that this line is not a seam, but rather an angular change at the corner 370. That is, the corner 370 is a continuous homogeneous material and is not welded, glued, or otherwise joined together. Inside the corner 370 of the pad 300, a key 350 may be formed along the bottom surface 352 and / or the inner perimeter 345, and the key 350 protrudes into the inner region surrounded by the pad 300. Although the key 350 is shown as rectangular, it should be understood that the key may be elliptical or any other suitable shape. The mating portion 353 meets at the key 350 in the corner 370 of the pad 300.

[0046] In one example, the gasket 300 is formed continuously without joints or seams. For example, the corner 370 of the gasket 300 is not welded or otherwise discontinuous, thereby substantially preventing air leakage. Furthermore, when the gasket 300 is formed as a single, seamless component, small radii, sharp corners, or other profiles can be used to maximize contact between the gasket 300 and the retaining frame assembly 102 to form a substantially airtight seal along the outer corner 349 of the filter frame 180. The gasket 300 is continuous, without joints or seams, and provides a seal around the entire filter frame 180. In alternative examples, the gasket 300 may include joints or seams, but not at the outer corner 349, and may be made of multiple segments. In other examples, the gasket 300 may include joints or seams at the outer corner 349, although such a configuration increases the risk of leakage.

[0047] The filter frame 180 has a channel 253 or slot, and a mating portion 353 of the gasket 300 is configured to engage in the channel 253 or slot. A key 350 of the gasket 300 is configured to engage and mate with a recess 310 of the filter frame 180. The recess 310 of the filter frame 180 can be of any shape, such as cylindrical or rectangular, and provides a positioning point for the key 350 to secure and orient the gasket 300 to the filter frame 180. The key 350 and the mating recess 310 also help prevent the gasket 300 from rotating on the filter 110, which could cause particular damage, and also prevent the gasket 300 from being mounted in a rearward direction, which could promote leakage and / or allow the filter 110 to move undesirably within the filter frame 180. The mating portion 353 and the key 350 have different cross-sectional profiles; that is, the key 350 has a larger cross-sectional profile than the mating portion 353. Different cross-sectional profiles ensure that key 350 fits only in recess 310 and prevent key 350 from extending into channel 253.

[0048] The key 350 of the gasket 300 may have a length and width substantially similar to that of the recess 310, so as to form a tight fit between the key 350 and the recess 310. Similarly, the channel 253 may have substantially the same dimensions and shape as the mating portion 353, such that a tight fit is formed between the mating portion 353 and the channel 253 when the mating portion 353 is inserted into the channel 253. It should be understood that when the mating portion 353 is inserted into the channel 253 and the key 350 is inserted into the recess 310, the gasket 300 is securely held in place on the filter frame 180. With the gasket 300 securely held in place on the filter frame 180, a substantially airtight seal is formed between the gasket 300 and the filter frame 180. Advantageously, the gasket 300 can be easily removed from the filter frame 180 and replaced or even reused as needed. However, it should also be understood that the gasket 300 described herein may be glued to the filter frame 180 with a low-strength adhesive. Such a liner 300 may optionally omit the mating portion 353 and key 350 used to hold the liner 300 in the filter frame 180.

[0049] like Figure 3DAs shown, gasket 300 is disposed on the downstream surface 321 of filter frame 180. Channel 253 is disposed on the downstream surface 321 of filter frame 180. In other examples, gasket 300 is disposed on the upstream surface 322 of filter frame 180. Channel 253 is disposed on the upstream surface 322 of filter frame 180. It is contemplated that filter frame 180 may have more than one channel 253, for example, disposed on both the upstream surface 322 and the downstream surface 321 of filter frame 180. It should also be understood that gasket 300 may be alternately stretched around the outer perimeter 342 of filter frame 180 such that elastic compression of gasket 300 holds gasket 300 in place on the outer perimeter 342 of filter frame 180. In any configuration, outer edge 343 of gasket extends beyond the outer perimeter 342 of filter frame 180 to form a seal in retaining frame assembly 102. Here, the channel 253 may optionally be arranged on the outer perimeter 342 of the filter frame 180. In one embodiment, the filter frame 180 has a channel 253 arranged on both the upstream surface 322 and the downstream surface 321, as well as on the outer perimeter 342 of the filter frame 180. Advantageously, the filter frame 180 may have channels 253 mirrored on both sides of the filter frame 180, which allows the gasket 300 to be mounted on either side.

[0050] The pad 300 can have a variety of alternative profiles. Figures 4A to 5A Some of their outlines are shown in the image. Figure 4AA first cross-sectional profile of the liner 300 is shown. The liner 300 includes an annular body 410. The body 410 (shown in cross-sectional profile) has a rectangular mating portion 353 configured to fit within a channel 253 of a filter frame 180. A first beveled surface 401 extends over a downstream surface 321 of the filter frame 180 from an inner perimeter 345 to a peak 303. The peak 303 is the furthest extension of the body 410 over the downstream surface 321 of the filter frame 180. The peak is configured to extend about 0.1 inches to about 0.2 inches around the filter frame 180. A second beveled surface 402 extends from the peak 303 to a flat surface that extends to the outer perimeter of the filter frame 180. A flange 490 of the body 410 extends downward from the second beveled surface 402 to the outer perimeter 343 of the liner 300. The flange 490 may have a length of 0.5 inches or greater. Flange 490 extends outward from outer perimeter 342 to form a sealing feature. Flange 490 has a thickness between 0.025 inches and approximately 0.100 inches and a length between approximately 0.3 inches and approximately 1.00 inches. Flange 490 is configured at an angle between 45 degrees and 90 degrees, such as between approximately 70 degrees and approximately 80 degrees, to the outer perimeter 343 of the filter frame 180. The flange, being longer than the body, has a wider angle relative to the body (i.e., downward and away from the top surface) to promote flexibility, which facilitates sealing and provides greater tolerance. In one embodiment, flange 490 may have one or more barbs 491, flaps, serrations, or other features extending therefrom. When flange 490 is compressed and / or bent as filter frame 180 is mounted in retaining frame 116, barbs 491 help engage retaining frame 116 and form a seal. Advantageously, the gasket 300 has two sealing surfaces, one formed at the peak 303 and the other formed at the outer perimeter 343 or flange 490, for forming a substantially airtight seal. The gasket 300 can be manufactured to be fairly rigid and solid to extend its service life while minimizing excess material.

[0051] Figure 4B An alternative cross-sectional profile of the gasket 300 is shown. The gasket 300 has an annular body 420. The body 420 has a flange 490, which is substantially similar to the... Figure 4AThe flange under discussion. The body 420 has a rectangular mating portion 353 configured to fit within a channel 253 of the filter frame 180. The body 420 has an inner flat surface 492 that helps stabilize the gasket 300 on the downstream surface 321 of the filter frame 180. A portion of the generally rectangular shape of the body 420 extends above the downstream surface 321 of the filter frame 180. The body 420 has a top surface 429 forming a sealing surface. The top surface 429 of the body 420 is generally flat. The top surface 429 of the body 420 may be parallel to the downstream surface 321 of the filter frame 180. Advantageously, the gasket 300 has two sealing surfaces, one at the top surface 429 of the body 420 and another at the outer perimeter 343, for forming an airtight seal. The gasket 300 may be made rigid and solid to extend its service life and facilitate reuse.

[0052] Figure 4C Another alternative cross-sectional profile of the liner 300 is shown. The liner 300 has a body 430. The body 430 has a rectangular mating portion 353 configured to fit into a channel 253 of the filter frame 180. The mating portion 353 extends into the channel 254 for approximately 0.15 inches to approximately 0.5 inches. The body 430 has an inner flat surface 492 that helps to stabilize the liner 300 on the downstream surface 321 of the filter frame 180. The body 430 has a flange 490 that is substantially similar to the... Figure 4A The flange under discussion. The body 430 has a circular top surface 439. The circular top surface 439 extends from the inner flat surface 492 to the flange 490. The body 430 has a hollow portion 311 disposed below the circular top surface 439 and above the rectangular mating portion 353. The hollow portion 311 completely encloses the interior of the body 430. The hollow portion 311 allows the circular top surface 439 of the body 430 to be compressed to facilitate the installation of the air filter 110 into the retaining frame assembly 102, while forming a good seal between the filter frame 180 and the retaining frame 116. Advantageously, the gasket 300 has two sealing surfaces, one at the circular top surface 439 of the body 430 and the other at the outer perimeter 343 of the gasket 300, for forming a substantially airtight seal. The flange 490 also provides stability and retains the filter in the retaining frame 116.

[0053] Figure 4D Another alternative cross-sectional profile of the gasket 300 is shown. The gasket 300 has an annular body 440. The body 440 has a rectangular mating portion 353 configured to fit into a channel 253 of the filter frame 180. The body 440 has a flange 490, which is substantially similar to the... Figure 4A The flange under discussion. The body 440 has an inner flat surface 492 that helps stabilize the gasket 300 on the downstream surface 321 of the filter frame 180. The body 440 has a rounded top surface 449. The rounded top surface 449 extends from the flange 490 toward the inner flat surface 492. A gap 441 is provided between the rounded top surface 449 and the inner flat surface 492 such that the rounded top surface 449 does not extend all the way to the inner flat surface 492. The body 440 has a hollow portion 311 disposed in the interior of the body 440 below the rounded top surface 449 and above the rectangular mating portion 353. The hollow portion 311 is exposed to the outer portion of the body 430 through the gap 441. The hollow portion 311 allows the rounded top surface 449 of the body 430 to be compressed for easier installation of the filter frame 180 and to form a good seal. When the air filter 110 is installed in the retaining frame 116, the gap 441 allows air to escape from the hollow portion 311, thereby creating a more snug and secure seal. Advantageously, the gasket 300 has two sealing surfaces, one at the circular top surface 449 of the body 430 and the other at the outer perimeter 343 or flange 490.

[0054] Figure 4E Another cross-sectional profile of the gasket 300 is shown. The gasket 300 has an annular body 450. The body 450 has a rectangular mating portion 353 configured to fit into a channel 253 of the filter frame 180. The body 450 has a flange 490, which is substantially similar to the... Figure 4A The flange under discussion. The body 450 has an inner flat surface 492 that helps stabilize the gasket 300 on the downstream surface 321 of the filter frame 180. The body 450 has a circular top surface 459. The circular top surface 459 extends completely from the flange 490 to the inner perimeter 345 of the gasket 300. The body 450 is entirely solid. Advantageously, the gasket 300 has two sealing surfaces, one at the circular top surface 459 of the body 450 and the other at the outer perimeter 343 and / or the flange 490.

[0055] During the installation of the air filter 110 into the retaining frame 116, the material and profile selection of the gasket 300 facilitates the deflection and compression of the gasket 300 for securing the filter 110 to the retaining frame assembly 102 without requiring secondary mechanical fasteners. During filter installation, the gasket 300 deflects to seal the air filter 110 to the retaining frame assembly 102. Furthermore, the gasket 300 forms a continuous loop around the entire outer perimeter 343 of the filter frame 180, including the outer corner 349, thereby minimizing potential air bypass.

[0056] Figure 4F It is a local cross-sectional profile, which shows Figure 3A The sixth example is the interface between the gasket 300 of the air filter 110 and the filter frame 180. The gasket 300 has an annular body 460. The body 460 has a rectangular mating portion 353 configured to fit into a channel 253 in the filter frame 180. The body 460 has a flange 490, which is substantially similar to the... Figure 4A The flange under discussion. Body 460 has an inner flat surface 492 along the inner edge 465 of the liner 300, which helps stabilize the liner 300 on the downstream surface 321 of the filter frame 180. Body 460 has a flat top surface 469. The flat top surface 459 has a protrusion 464 extending from the flat top surface 459 at or near the flange 490. The flat top surface 469 extends from the protrusion 464 to the inner edge 465 of the liner 300. The protrusion 464 extends at an angle 466 toward the inner edge 465 away from the flat top surface 469. The angle 466 of the protrusion 464 determines the height 467 of the protrusion 464 extending above the flat top surface 469. The angle 466 of the protrusion 464 can be between 90 degrees and about 30 degrees (such as 60 degrees).

[0057] The main body 460 is formed by multiple elements arranged in a trapezoidal manner in the rectangular mating portion 253. The rectangular mating portion 253 has multiple transverse members 463 (in Figure 4F The cross-sectional view shows the front portion of one of them, which connects to the outer wall 462 of the inner wall 461. A plurality of transverse members 463 may be substantially orthogonal to the outer wall 462 and the flat top surface 469. The plurality of transverse members 463 may also be substantially orthogonal to the inner wall 461. The plurality of transverse members 463 may be spaced apart to form hollow portions between them or to form a ladder-like structure in the rectangular mating portion 253. Alternatively, the transverse members 463 may have any suitable geometry, such as a honeycomb structure below the flat top surface 469 and forming the rectangular mating portion 253, which allows for a minimization of the amount of material used to achieve maximum stiffness with minimal weight and material cost. In one example, the outer wall 462, the plurality of transverse members 463, and the inner wall 461 form a ladder-like structure at the bottom of the rectangular mating portion 253. Figure 8B The text also depicts a ladder-like structure.

[0058] See also Figure 4FThe gasket 300 advantageously has two sealing surfaces, one at the protrusion 464 and one at the flange 490. During the installation of the air filter 110 into the retaining frame 116, the material and profile selection of the gasket 300 facilitates the deflection and compression of the gasket 300 for securing the filter 110 to the retaining frame assembly 102, without requiring secondary mechanical fasteners. Furthermore, the array of elements forming the mating portion 253 reduces the amount of material, thus saving costs, while also allowing the mating portion 253 to be compressed for easy installation. During filter installation, the gasket 300 deflects to seal the air filter 110 to the retaining frame assembly 102. Additionally, the gasket 300 forms a continuous loop around the entire outer perimeter 343 of the filter frame 180, including the outer corner 349, thereby minimizing potential air bypass.

[0059] Figure 5A Another cross-sectional profile of the gasket 300 is shown. The gasket 300 has an annular body 510 with an outwardly extending flange 490. The gasket 300 has an outer rib 501 that extends from the bottom of the flange 490 and is adjacent to the flat surface of the body 510. The downstream surface 321 of the filter frame 180 is configured to insert into a slot formed between the body 510 and the outer rib 501 to help secure the gasket 300 to the filter frame 180. Although the gasket 300 is shown in cross-section as substantially similar to Figure 4A The cross-section of the gasket 300 is shown, but it should be understood that... Figure 5A The pad 300 shown may have other cross-sectional profiles, such as, but not limited to, Figures 4A to 4F The cross-sectional profile shown. Figures 4A to 4F The gasket profile shown may optionally include an outer rib 501. During the installation of the filter frame 180, the outer rib 501 is configured to prevent the gasket 300 from rolling out or off the filter frame 180, and to help hold the gasket in place when a torque is applied to the flange 490.

[0060] The outer rib 501 is spaced apart from the rectangular mating portion 353, such that a portion of the filter frame 180 is sandwiched between them. When the rectangular mating portion 353 is within the channel 253 of the filter frame 180, the outer rib 501 can directly contact the filter frame 180. The outer rib 501 can be rectangular, rectangular, triangular, or any shape, such that the flat portion of the outer rib 501 abuts the outer perimeter 342 of the filter frame 180. The length of the outer rib 501 surrounding the gasket 300 can be continuous. Alternatively, the outer rib 501 can be formed from segments 571, 572, such as four or more segments. Figure 5B and Figure 5CAn outer rib is shown in a corner section. This outer rib may not necessarily represent a continuous nature of the outer rib 501, as in some examples the outer rib 501 may only be present at the corner to securely hold the gasket 300 in place within the filter frame 180. In some examples where the outer rib 501 is present at the corner 370, the gasket 300 may omit the key 350 included in the filter frame 180 for securing the gasket 300 in place.

[0061] Figure 5B It shows Figure 5A A perspective view of an exemplary corner configuration of the outer rib 501 of the gasket 300. The outer rib 501 does not extend fully to the corner 370 of the gasket 300. The outer rib 501 may extend a distance 560 from the outer corner 349 of the filter frame 180. The outer corner 349 is also aligned with the corner 370 of the gasket 300. The distance 560 may be between about 1 mm and about 50 mm or greater. The outer rib 501 having a distance 560 from the outer corner 349 of the retaining frame 116 allows for easier installation of the gasket 300 while still having the benefits of the outer rib 501 for stabilizing and securing the gasket 300 to the filter frame 180.

[0062] Figure 5C It shows Figure 5A A perspective view of another exemplary corner configuration of the outer rib 501 of the gasket 300. The outer rib 501 extends fully to the corner 370 of the gasket 300 and similarly to the outer corner 349 of the filter frame 180. Thus, a rib corner 515 is formed where the outer ribs 501 meet on adjacent sides of the filter frame 180 (i.e., walls 202, 204, 206, 208). The rib corner 515 is a continuous homogeneous material and is not welded, glued, or otherwise joined together. The outer rib 501 allows the gasket 300 to be securely fixed to the filter frame 180. Furthermore, the outer rib 501 with the rib corner 515 is not easily damaged when the gasket 300 is being installed on the filter frame 180.

[0063] It should be understood that a liner (essentially similar to liner 300) may also remain on the outer perimeter 342 of the filter frame 180. Figure 6A A perspective view of an exemplary pad 600 arranged on the outer perimeter 342 of a filter frame 180 is shown. Figure 6B It shows Figure 6AThe diagram shows a cross-sectional view of an example of the gasket 600. The gasket 600 has a T-shaped profile and an annular body 610 stretched over a filter frame 180 such that the annular body is elastically compressed to hold the gasket 300 on the outer perimeter of the filter frame 180. The T-shaped body 610 has a central flange 690 extending from a base portion 612 of the body 610. It should be understood that the central flange 690 bisects the base portion 612 of the body 610. It should also be understood that the central flange 690 may be offset from the centerline that bisects the base portion 612 of the body 610. The base portion 612 is configured to be disposed on the outer perimeter 342 of the filter frame 180. For example, the distance 691 from the first end 601 to the centerline that bisects the central flange 690 may be greater than or less than the distance from the centerline to the second end 602 of the base portion. The distal end 643 of the central flange 690 forms a sealing surface between the filter frame 180 and the retaining frame 116.

[0064] Gasket 600 can be formed as described above with reference to gasket 300. Corner 675 of gasket 600 is continuously formed with the adjacent side of gasket 600. Corner 675 of gasket 600 can be formed with a radius, a sharp corner, or other profile to maximize contact between gasket 600 and retaining frame 116 for forming an airtight seal along the outer corner 349 of filter frame 180.

[0065] In some examples, the gasket 600 may be located in a channel (not shown) formed in the wall 304 of the filter frame 180. In other examples, the gasket 600 is disposed directly on the flat portion of the wall 304. The gasket 600 may have a width in the base portion 612 sufficient to prevent rolling and maintain good frictional adhesion to the wall 304 (i.e., at least twice the distance 691), such that the gasket 600 does not slip off the wall 304 when the filter frame 180 is mounted into the retaining frame 116. Advantageously, the gasket 600 can be adapted to existing filter frames while providing a good seal between the filter frame and the retaining frame.

[0066] As discussed above, an optional channel 253 may be arranged on the outer perimeter 342 of the filter frame 180 to lock the gasket 700 to the filter frame 180 and prevent it from sliding when the filter frame 180 is mounted in the retaining frame 116. In one example, the channel 253 may be configured to adapt to the base portion 612 of the gasket 700. In another example, the channel 253 may be configured to adapt to a protrusion extending inwardly from the base portion 612 of the gasket 700.

[0067] Figure 7 It shows that it can be used as an alternative Figure 6AAn orthographic view of another exemplary pad 700 shown in the diagram, representing pad 600. Pad 700 is substantially similar to pad 600, except that the central flange 690 is replaced by multiple flanges. Figure 7 In the depicted example, the gasket 700 includes a first flange 781 and a second flange 782. Alternatively, the gasket 700 may include additional flanges similar to flanges 781 and 782. The first flange 781 is substantially similar to the second flange 782. The first flange 781 and the second flange 782 have a corner 795 that can be formed at a radius or a 90° angle. The corner 795 is shaped in such a way that it provides a good seal between the outer corner 349 of the filter frame 180 and the retaining frame 116. Advantageously, the first flange 781 and the second flange 782 provide redundancy in the seal to prevent air leakage or bypassing in the gasket 700. Furthermore, when the filter frame 180 is mounted in the retaining frame 116, the first flange 781 and the second flange 782 balance the gasket 700 to further minimize rolling or movement of the gasket 700. In addition, the multiple flanges 781, 782 advantageously increase the frictional holding force that keeps the air filter 110 within the retaining frame 116.

[0068] Figure 8A yes Figure 4F A top view of a portion of another example of the pad 800 shown. The pad 800 is similar to... Figures 3A to 3D The gasket 300 is shown. The flange 490 of the gasket 800 has a cutout 854 at the corner 801 of the gasket. The flange 490 has a cutout 854 adjacent to each side of each corner 801. (See attached image.) Figures 8A to 8C As shown, the pad 800 has Figure 4F The cross-sectional profile shown is additionally characterized by a distinct corner profile on flange 490. However, it should be understood that many different profiles can be configured, some of which are shown in [reference needed]. Figures 4A to 4F A description has been provided. For clear understanding, it will be combined with... Figure 8C discuss Figure 8A . Figure 8C yes Figure 8A Top perspective view of the padding.

[0069] Similar to liner 300, liner 800 is formed from an elastic material as a continuous rectangular annular body 460. Liner 800 is adapted for use with the filter frame 180 of air filter 110. In one example, the inner perimeter 345 of liner 300 is at least 1200 mm. In another example, liner 300 is formed from an elastic material that allows the inner perimeter 345 of liner 300 to expand to at least 1200 mm.

[0070] The gasket 800 has a top surface 351, an outer perimeter 343, an inner perimeter 345, and a bottom surface 352 similar to those of the gasket 300. A flange 490 extends outward from the body 460 to form the outer perimeter 343. The outer edge 807 of the flange 490 extends along the outer perimeter 343. When mounted on the filter frame 180, the inner perimeter 345 faces the filter media 190, while the outer perimeter 343 extends beyond the outer perimeter 342 of the retaining frame 116. The body 460 has a protrusion 464 extending from the top surface 351 at or near the flange 490.

[0071] Corner 801 is shown as a line in the figure, where the top surface 351 of the gasket 800 changes direction. However, it should be understood that this line is not a seam, but rather an angular change at corner 801. That is, flange 490 is a continuous homogeneous material and is not welded, glued, or otherwise joined together at corner 801.

[0072] Figure 8B yes Figure 8A The image shows a bottom perspective view of the gasket 800. The flange 490 has a pair of cutouts 854 at a corner 801. The cutouts 854 are immediately adjacent to the corner 801. The cutouts 854 in the flange 490 can extend linearly from the corner 801 before transitioning to the outer edge 807. Alternatively, the cutouts 854 can extend from the corner 801 in an arc, S-curve, or other shape, such that the cutouts 854 at the corner 801 have a first extension 883 / 884 at a distance 885 from a second extension 881 / 882 that faces inwardly toward the outer edge 807. The cutouts 854 allow the flange 490 of the gasket 800 to fold in the corner 801 and form a 90-degree sealing surface to prevent leakage.

[0073] In one example, the gasket 800 further has a small cutout 852 in the flange 490. The small cutout 852 can provide clearance for the gasket 800 when mounted in a frame. The small cutout 852 can be arranged in one or more locations on the gasket 800. In one example, the small cutout 852 is located between a cutout in a cutout 854 and an adjacent outer edge 807.

[0074] This has the effect of producing a longer sealing edge from one corner 801 to the adjacent corner 801. For example, the length from one corner 801 to the adjacent corner 801 is shorter than the length of the combined outer edge 807 and the cut 854. Furthermore, the cut 854 reduces the amount of material in the corner 801. Advantageously, the cut 854 in the gasket 800 prevents material from folding in or around the corner 801, thus achieving a better seal while increasing the length of the seal.

[0075] The body 460 has a rectangular mating portion 353 configured to fit into a channel 253 of the filter frame 180. The liner 800 also has a key 850 (substantially similar to key 350) formed along the bottom surface 852 and / or inner perimeter 345. The key 850 protrudes into the interior region surrounded by the liner 800. Although the key 850 is shown as rectangular, it should be understood that the key can be elliptical or any other suitable shape. The mating portion 853 (substantially similar to mating portion 353) meets at the key 850 in the corner 801 of the liner 800.

[0076] In one example, the key 850 and the mating portion 853 have hollow sections. The key 850 and the mating portion 853 are formed as an array of elements. The outer wall 462 is connected to the inner wall 461 by a plurality of transverse members 463 in the key 850. The plurality of transverse members 463 can provide rigidity to the key 850 while reducing the amount of material used to form the gasket. Furthermore, the combination of transverse members 463 can be sized and configured to adjust the compression of the key 850, making the key 850 easier to install while providing good retention that matches the recess 310 of the filter frame 180.

[0077] Examples of gaskets independent of the air filters shown and discussed above offer numerous advantages over conventional gas cylinder filter frames. Advantageously, the continuity of the gasket with its full corners and the arrangement of the sealing surfaces provided by the gasket offer a better seal between the filter frame and the retaining frame of the air handling system. The various gaskets disclosed herein can be used with filter frames having complementary fit features, as well as other conventional air filter frames. The reusability of the air filter-independent gaskets and the ability to replace the gaskets and air filters independently reduce the overall cost of maintaining the air handling system.

[0078] In another embodiment, a removable gasket is disposed on a retaining frame. The gasket mates with the retaining frame. The retaining frame gasket has a rectangular annular body. The rectangular annular body has an inner perimeter and an outer perimeter. A channel can be formed in the inner perimeter to retain the gasket. The channel may have one or more slots configured to receive orifices of the gasket. The rectangular gasket has an inner surface and an outer surface along the perimeter of the gasket and opposite to the inner surface. The gasket has corners, wherein the corners are uniformly and completely formed without seams or welds. A first flange extends inwardly from the inner surface of the rectangular annular body, which extends continuously along the entire length of the body. The first flange has a fully formed corner similar to that discussed above for forming a seal with the filter frame. The gasket provides a seal for the air filter frame inserted therein.

[0079] While the foregoing describes embodiments of the present invention, other and further embodiments of the present invention may be designed without departing from the basic scope of protection of the present invention, and the scope of protection of the present invention is determined by the appended claims.

Claims

1. A replaceable air filter frame liner, comprising: A rectangular ring-shaped body, the body having a top surface, a bottom surface, an inner perimeter, an outer perimeter, and corners; A flange that extends outward from the outer perimeter of the body along the entire outer perimeter, the flange having a cutout disposed at each corner of the flange; A protrusion extending upward from the top surface; as well as The mating portion extends from the bottom surface of the body, which extends continuously along the entire outer perimeter.

2. The gasket of the replaceable air filter frame according to claim 1, further comprising: Rib, which extends from the flange in the direction of the mating portion.

3. The gasket of the replaceable air filter frame according to claim 1, wherein, The protrusion is continuous along the entire length of the top surface of the body.

4. The gasket of the replaceable air filter frame according to claim 1, wherein, The mating part has a transverse member.

5. The gasket of the replaceable air filter frame according to claim 1, further comprising: Rib, the rib extending from the flange in the direction of the mating portion; as well as A key, which extends from the bottom surface and is arranged in the corner of the liner.

6. The gasket of the replaceable air filter frame according to claim 5, wherein, The ribs and the keys have different cross-sectional profiles.

7. The gasket of the replaceable air filter frame according to claim 5, wherein, The rib and the key have hollow portions.

8. The gasket of the replaceable air filter frame according to claim 7, wherein, The hollow portion is not open.

9. The gasket of the replaceable air filter frame according to claim 1, wherein, The flange has multiple cutouts at each corner of the liner.

10. A liner for an air filter frame, comprising: A rectangular ring-shaped body, the body having an inner perimeter, an outer perimeter, and corners; A first flange, extending outwardly along the entire length of the body from its outer perimeter and configured to extend beyond the outer perimeter of the air filter frame when the gasket is fitted to the air filter frame, wherein the first flange has a pair of cutouts at the corners; and A protrusion that extends upward from the top surface of the body toward the inner perimeter at a certain angle.

11. The gasket of the air filter frame according to claim 10, wherein, The first flange is arranged close to the center line of the base portion of the body, which is a rectangular ring.

12. The gasket of the air filter frame according to claim 11, further comprising: A second flange extends outward from the outer perimeter of the body, which extends continuously along the entire length of the body, wherein the first flange is arranged close to a first distal end of the base portion of the rectangular annular body, and the second flange is arranged close to a second distal end of the base portion of the rectangular annular body.

13. The gasket of the air filter frame according to claim 10, wherein, The angle between the protrusion and the top surface is between 30° and 90°.

14. An air filter comprising: A rectangular filter frame having corners; Filter media, the filter media being arranged in the filter frame; as well as The replaceable air filter frame liner of claim 1, wherein the liner is resiliently fixed to and extends outward from the outer perimeter of the filter frame.

15. The air filter according to claim 14, wherein, The rectangular filter frame further includes: The body, wherein the downstream surface of the body has channels and recesses.

16. The air filter according to claim 15, wherein, The liner further includes: An elastic body having four corners, the elastic body comprising: A key, configured to fit into the recess, wherein the horizontal profile of the key is shaped differently from the horizontal profile of the mating portion, and the key does not fit into the channel.

17. The air filter according to claim 16, wherein, The liner has a closed, hollow interior.

18. The air filter according to claim 16, wherein, The liner further includes: Ribs, the ribs extending from the flange in the direction of the mating portion; and At least one rib corner, the at least one rib corner being in the corner of the pad, the at least one rib corner extending along two walls of the outer perimeter.

19. The air filter according to claim 16, wherein, The flange further includes: Multiple cuts along the outer perimeter at each corner of the flange.

20. The air filter according to claim 19, wherein, The multiple cuts are located adjacent to the corner.

Images