Air treatment terminal unit for a building

Abstract

The terminal unit (1) comprises a rigid diffuser (10) and a flexible plenum (20), as well as means (30) for permanently assembling the diffuser and the plenum. The diffuser comprises a plate perforated by air deflection passages (14) connecting the inner (12) and outer (13) flat faces of the plate and adapted to extend continuously in a plane formed by a false ceiling when the terminal unit (1) is installed in a free space separating a ceiling and a false ceiling. The plenum comprises an enclosure (21) defining an air distribution volume (V21) and made of a material more flexible than the diffuser material and deformable by hand to move the enclosure between expanded and contracted configurations.The envelope includes a main body (22), which closes the air distribution volume except at a first opening (22A), covered by the inner face of the plate, and a second opening (22B), and a sleeve (23) extending lengthwise from the main body outside the air distribution volume between one end (23A) of the sleeve, fitted to the second opening, and an opposite end (23B) of the sleeve, adapted to be connected to a ventilation duct (5).

Description

[0001] The present invention relates to a terminal air treatment unit for a building.

[0002] To treat, and in particular renew, the air in a building, a ventilation system is generally installed. This system supplies and / or extracts air from various locations within the building, each equipped with a terminal air handling unit. Each terminal unit comprises a plenum through which air circulates and is distributed between a ventilation system duct, which opens into the plenum, and a diffuser. Air passes through the diffuser, being supplied to the building when the ventilation system is under positive pressure, or being drawn from the building when the system is under negative pressure. Typically, the diffuser is mounted on the plenum, positioned across a corresponding opening in the plenum. The plenum incorporates a pipe around which the ventilation system duct is attached and secured.

[0003] The diffuser and plenum are traditionally made as rigid units, although alternatives have been proposed in the past. In particular, the diffuser is often made of a steel or aluminum plate, which gives it good air diffusion characteristics as well as an appealing aesthetic. The plenum, on the other hand, is often a metal box, shaped like a rectangular prism or a truncated pyramid. This metal box, which is generally installed in a suspended ceiling, is valued for its fire resistance, its ability to be quickly assembled to the diffuser, and its capacity to be internally pressurized or depressurized. However, such a metal box has drawbacks. Its rigid structure means the box takes up space during transport and storage and can render it unusable if the suspended ceiling is cluttered or too small.Furthermore, the weight of the box makes it difficult to install at height, especially its arrangement in the false ceiling and / or its attachment to a ceiling.

[0004] EP 0 175 892 A1 discloses an air distribution duct whose cross-sectional area decreases continuously in the direction of airflow within the duct. This distribution duct consists, along its entire length, of a deformable upper section, for example made of fabric, and a rigid lower section, which is characterized by its upward-facing gutter shape. The rigid lower section consists of a base framed by two lateral walls inclined symmetrically with respect to the base. Regularly spaced openings are made in the lateral walls along the length of the distribution duct.

[0005] WO 01 / 04547 A1 discloses an air distribution duct designed to extend parallel to the ceiling of a room into which air is supplied through the interior of the air distribution duct. The air distribution duct has an open longitudinal end that is mounted directly onto an air supply manifold. Opposite its open longitudinal end, the air distribution duct has a longitudinal end that is closed by an end cap sealing the air distribution duct.Between its open and closed longitudinal ends, the air distribution duct consists of four panels, each extending along the entire length of the air distribution duct and assembled in a sealed manner to one another, these four panels being (i) two fabric side panels, (ii) a top panel, which is made either of fabric like the side panels or of a rigid material, and (iii) a bottom panel, which is made of a rigid material and is specifically designed to maintain the tubular shape of the envelope formed by the side panels, this bottom panel having for this purpose a portion-of-a-tube shape.

[0006] WO 2020 / 096966 A1 discloses an air diffusion device made of fabric. This air diffusion device comprises a circumferential panel, made of fabric and provided with through openings, and a lower panel, also made of fabric but having an air porosity that is less than that of the circumferential panel, or even zero.

[0007] Finally, WO 2020 / 252365 A1 discloses a nozzle designed to be attached laterally to a ventilation duct, consisting of a fabric tube and which can be fitted with a conical end tip, again without using a rigid plate.

[0008] The materials envisaged in EP 0 175 892 A1, WO 01 / 04547 A1, WO 2020 / 096966 A1 and WO 2020 / 252365 A1 are not practical to implement and cannot be integrated into the plan of a false ceiling.

[0009] The aim of the present invention is to propose a new terminal air treatment unit which, while being efficient and adapted to market expectations, is also more practical.

[0010] For this purpose, the invention relates to a terminal air treatment unit for a building, as defined in claim 1.

[0011] One of the ideas behind the invention is to combine a rigid diffuser, valued for its aerodynamic and aesthetic qualities, with a cleverly flexible plenum. Thus, the invention provides that a plenum casing, which defines the internal volume of the plenum in which air circulates and is distributed between the diffuser and a ventilation duct, is made of a material that is flexible compared to the rigid material of which an air diffusion plate belonging to the diffuser is made. This material is also deformable by hand, allowing the casing to be reversibly moved between its deployed and retracted configurations. The air diffusion plate facilitates the integration of the terminal unit into a false ceiling.When the terminal air handling unit according to the invention is in operation, the casing is in its deployed configuration and provides a standard internal air distribution, provided that the plenum casing material has a suitable level of airtightness. The diffuser of this terminal unit is advantageously reversibly fixed to the flexible plenum by covering an opening in the main body of the plenum casing, while another opening in this main body leads into a sleeve in the casing. This sleeve extends from the main body to the outside of the aforementioned internal volume and can be easily and reliably connected to the ventilation duct, as detailed below. The plenum casing makes it particularly easy to install at height due to its inherent flexibility and lightness, especially compared to a metal casing as described above.Similarly, due to its flexibility, the plenum casing attenuates noise from the ventilation duct, particularly compared to a metal enclosure as described above. Before commissioning the air handling unit according to the invention, the plenum casing can be stored and transported in a contracted configuration, which is particularly practical and economical. As detailed below, the flexible and deformable material constituting the plenum casing is advantageously made, in part or in whole, of a textile material and / or a non-textile material. In all cases, this flexible and deformable material is advantageously provided with additional functionalities, for example, being washable and / or flame-retardant and / or air-purifying, in particular being antibacterial, antifungal, virucidal, and / or pollution-reducing.Furthermore, the air handling unit according to the invention is advantageously usable both for supplying air into a building, by pressurizing the interior of its plenum casing, which is thus maintained in its deployed configuration due to this internal overpressure, and for recirculating air from inside a building, by depressurizing the interior of its plenum casing and using appropriate means to maintain the casing in its deployed configuration, such means being detailed later. More generally, the flexible plenum of the air handling unit according to the invention advantageously offers the same benefits as a metal casing as described above, without suffering from the drawbacks related to its rigidity and weight.

[0012] Additional advantageous features of the terminal air treatment unit according to the invention are specified in the other claims.

[0013] The invention will be better understood upon reading the following description, given solely by way of example and made with reference to the drawings in which: [ Fig. 1 ] there figure 1 is a schematic perspective view of a terminal air handling unit according to the invention, in operation in a building; [ Fig. 2 ] there figure 2 is also a schematic perspective view of the terminal unit of the figure 1 , shown alone, the angle of observation of the figure 2 being different from that of the figure 1 ; Fig. 3 ] there figure 3 is a schematic cross-section in plane III of the figure 2 ; And [ Fig. 4 ] there figure 4 is a view similar to the figure 2illustrating the terminal unit in a configuration different from that illustrated in figures 1 to 3 .

[0014] On the figures 1 to 4 Figure 1 represents a terminal air handling unit for a building 2. This terminal unit 1 treats, and in particular renews, the air in building 2 and, for this purpose, belongs to a ventilation network that supplies or extracts air from the interior of building 2. Air exchange with the interior of a room 3 in building 2 occurs at the terminal unit 1, located in this room 3, typically in its ceiling 4. The nature of building 2 is not limiting; it could be either a residential building or a commercial building, that is, a building open to the public and / or used for commercial activities.

[0015] As clearly visible on the figures 1 to 4The terminal unit 1 comprises two main components: a diffuser 10 and a plenum 20. As explained in detail later, the diffuser 10 is rigid compared to the plenum 20, the latter thus being considered flexible compared to the diffuser 10. In the assembled state of the terminal unit 1, the diffuser 10 and the plenum 20 are fixedly joined to each other by assembly means 30, more specifically visible on the figure 3 These assembly means 30, which will be detailed later, are advantageously reversible in the sense that they allow the diffuser 10 and the plenum 20 to be detached and reattached at will.

[0016] As clearly visible on the Figures 1 And 3The diffuser 10 includes a plate 11 which can be described as rigid in the sense that the material constituting the plate 11 is rigid, fixing the geometric shape of the plate 11, without the possibility of altering this shape other than by damaging the plate 11. Preferably, the material constituting the plate 11 comprises or consists of a metallic material, such as steel or aluminum, and / or a plastic material, such as rigid PVC.

[0017] On each of the two main sides of the plate 11, it presents a flat face 12, respectively 13. These two flat faces 12 and 13 are thus opposed to each other along the thickness direction of the plate 11, corresponding respectively to an inner face 12, which is turned towards the plenum 20, and an outer face 13.

[0018] Also, as clearly visible on the Figures 1 And 3, plate 11 is perforated by through passages 14 which connect the inner face 12 and outer face 13. These through passages 14 allow air to pass through plate 11, being deflected in order to better distribute the air thus diffused.In practice, when terminal unit 1 is used to supply air into room 3 of building 2, the air passes through plate 11 from the inner face 12 to the outer face 13 via the through passages 14 which deflect the airflows circulating there in such a way as to distribute the corresponding air intake throughout substantially the entire room 3; when terminal unit 1 is used to extract air from room 3, the air passes through plate 11 from the outer face 13 to the inner face 12 via the through passages 14 which deflect the airflows circulating there in such a way as to distribute the corresponding air return from substantially the entire room 3.

[0019] As clearly visible on the figures 1 to 4 The plenum 20 comprises an envelope 21 defining an internal volume V21. The internal volume V21 allows the air circulating within it to distribute itself inside the envelope 21.

[0020] The casing 21 is made of a material that is more flexible than the material constituting the plate 11. This material of the casing 21 is flexible, being deformable by hand so as to allow the casing 21 to pass between a deployed configuration, illustrated in the figures 1 to 3 , and a contracted configuration, illustrated on the figure 4 The internal volume V21 is larger when the envelope 21 is in its deployed configuration than when the envelope 21 is in its contracted configuration. Regardless of the material constituting the envelope 21, the latter includes a main body 22 delimiting the internal volume V21, as well as a sleeve 23 which extends lengthwise from the main body 22 outside the internal volume V21, and this between two ends 23A and 23B of the sleeve 23, opposite each other along the longitudinal direction of this sleeve.

[0021] In practice, multiple forms of embodiment are conceivable for the material constituting the envelope 21, it being noted that, in view of the fact that the envelope 21 ensures, by its internal volume V21, the technical function of air distribution, it is understood that this material is at least partially airtight, in particular in the sense that its air permeability is less than 14 ℓ / (sm 2< ).

[0022] According to one possibility, the material constituting the envelope 21 comprises or consists of one or more textile materials, a textile material being a material obtained from spinning and then weaving and / or calendering fibers, coated or uncoated. Examples of textile materials are nylon, cotton, polyester, fiberglass, etc.

[0023] According to a second possibility, the material constituting the envelope 21 comprises or consists of one or more materials other than a textile material, that is to say, one or more materials not derived from weaving and / or calendering fibers. Examples of materials other than a textile material are PVC film, polyethylene film, linoleum, vinyl, rubber, resin, etc.

[0024] It is certainly conceivable that the material constituting the envelope 21 is a composite or complex material, that is to say, a material made up of an assembly of several components, possibly having different respective natures, these components forming layers, which are superimposed on one another, and / or forming pieces, possibly pre-formed, of the same layer, which are assembled together to create a patchwork. In other words, the envelope 21 can result from the assembly of several pieces of different or identical structures.When such a composite material combines a first component, made of textile, and one or more other components, each made of textile or of a material other than textile, the assembly of the first and the other components is advantageously carried out by sewing; for example, in the embodiment illustrated in the figures, the cover 21 is thus formed of six pieces sewn edge to edge, namely four peripheral pieces and a top base piece, which together form the main body 22, and a piece forming the sleeve 23. When such a composite material combines a first component, made of a material other than textile, and one or more other components, each made of a material other than textile, the assembly of the first and the other components is advantageously carried out by means other than sewing, in particular by stapling, heat sealing, etc.According to an advantageous but not limiting embodiment, the material constituting the envelope 21 comprises two textile layers, optionally individually identical, which are superimposed, and a thermally insulating layer, which is interposed between the two textile layers and which is made of a material other than a textile material, such as rock wool or wadding, the two textile layers being advantageously sewn together as shown schematically in dotted lines on the . figures 2 And 4 .

[0025] In all cases, the material constituting the casing 21 is advantageously designed, particularly by virtue of its formulation and / or structure, to provide the casing 21 with additional functions of interest in the field of air handling equipment. The material constituting the casing 21 is thus advantageously: washable, and / or non-flammable, and / or an air-purifying material, including antibacterial, antifungal, virucidal and / or pollution-reducing.

[0026] Furthermore, the material constituting the envelope 21 is advantageously derived at least in part from recycled materials.

[0027] In all cases, as clearly visible on the figure 3 The main body 22 delimits the internal volume V21 by closing the latter over its entire perimeter surface, except at the level of two through openings 22A and 22B of the main body 22, which are distinct from each other and which are advantageously located on different respective sides of the main body 22. The geometric shape of the main body 22 is not limiting, being for example globally parallelepiped or in the shape of a truncated pyramid.

[0028] In the assembled state of the terminal unit 1, the opening 22A of the main body 22 is covered by the inner face 12 of the plate 11. Thus, the plate 11 effectively closes the opening 22A over its entire extent, although it should be noted that the plate 11 is perforated by the through passages 14. This arrangement of the plate 11 relative to the main body 22 is advantageously used for the purpose of assembling the diffuser 10 and the plenum 20 together. For this purpose, as shown in the embodiment in the figures and as clearly visible in the figure 3The assembly means 30 comprise two elements 31 and 32 designed to cooperate, particularly mechanically, with each other so as to permanently assemble the diffuser 10 and the plenum 20 to each other, where appropriate reversibly: the element 31 is carried by the diffuser 10 and is arranged on a peripheral portion of the inner face 12 of the plate 11, within which the through passages 14 are located, while the element 32 is carried by the plenum 20 and is arranged on an edge of the opening 22A. By way of preferred example, the elements 31 and 32 correspond to, respectively, a textured hook strip and a textured loop strip, which belong to a self-gripping fastening system, commonly called the "Velcro" system (registered trademark).That being said, other forms of embodiment are of course conceivable for elements 31 and 32: for example, element 31 consists of a group of male elements, distributed on the inner face 12 of the plate 11, and element 32 consists of a group of female elements, distributed on the edge of the opening 22A and capable of receiving and being engaged by the aforementioned male elements.

[0029] The opening 22B of the main body 22 is, in turn, abutted to the end 23A of the sleeve 23, this end 23A being fitted to the opening 22B, so that the sleeve 23 opens entirely into the opening 22B via its end 23A. The interior of the main body 22 and the interior of the sleeve 23 are thus in free fluidic communication with each other.

[0030] The end 23B of the sleeve 23 is adapted for connection to a ventilation duct 5 belonging to the ventilation network mentioned above. According to a particularly practical and advantageous arrangement, implemented in the embodiment shown in the figures, the end 23B of the sleeve 23 is fitted with an elastic retaining collar 24, which is adapted to be fitted around and clamp the ventilation duct 5 by elastic deformation, as schematically shown in the figures. figures 2 And 3Thus, the fixing collar 24 has an inner diameter which varies, through the elastic deformation of this fixing collar 24, between a minimum value, which is reached when the fixing collar 24 is at rest and which is less than the outer diameter of the ventilation duct 5, and a maximum value, which is reached when the fixing collar 24 is stretched and which is greater than the outer diameter of the ventilation duct 5. The connection between the sleeve 23 and the ventilation duct 5 is therefore particularly easy, regardless of the specific characteristics of the ventilation duct 5.

[0031] According to an advantageous optional provision, which is implemented in the embodiment shown in the figures and which is visible only in the figure 3, the plenum 20 includes a sleeve 40 for filtering the air circulating inside the plenum 20. The sleeve 40 is arranged inside the internal volume V21 of the envelope 21 and is fixed to the main body 22 of this envelope, extending lengthwise in the longitudinal extension of the sleeve 23, and this between two ends 40A and 40B of the sleeve 40, opposite each other along the longitudinal direction of this sleeve. The end 40A of the sleeve 40 is fitted to the opening 22B of the main body 22, so that the sleeve 23 opens entirely into the sleeve 40, via the end 23A of the sleeve 23 and the end 40A of the sleeve 40. The end 40B of the sleeve 40 is, however, closed, giving the sleeve an overall tubular pocket shape, open only at its end 40A, as clearly visible in the figure 3To filter the air passing through the wall of the cuff 40, the material of the cuff is porous, designed to retain fine particles present in the air. The specific characteristics of the material constituting the cuff 40 are not limiting, provided it offers air filtration capacity, and it should be noted that this material is advantageously flexible, exhibiting a flexibility similar to that of the casing 21.

[0032] In practice, the attachment of the cuff 40 to the main body 22 is advantageously removable, thus allowing the cuff 40 to be easily detached from the main body 22 and replaced regularly. This removable attachment is achieved by any suitable means, for example, a hook-and-loop fastening system, a zipper system, such as a "Zipper" (registered trademark), etc.

[0033] To allow the terminal unit 1 to be installed at the ceiling 4 of room 3, the terminal unit 1 advantageously includes hanging means 50 which allow the diffuser 10 and / or the plenum 20 to be suspended from the ceiling 4.

[0034] In the embodiment shown in the figures, the attachment means 50 act exclusively on the plenum 20, while the diffuser 10 is held in place by its fixed assembly with the plenum 20: for this purpose, as clearly visible in the Figures 1 And 2 The hanging means 50 include fastening elements 51, carried by the envelope 21, and suspension lines 52, connecting the fastening elements 51 to the ceiling 4. The fastening elements 51 correspond, for example, to slides which are fixed, by sewing or gluing, in external projection to the envelope 21. The suspension lines 52 are, for example, cables which, during installation, are stretched between the fastening elements 51 and the ceiling 4.

[0035] According to one embodiment, which is complementary or alternative to that illustrated in the figures and which is not shown in the figures, the hanging means 50 comprise attachment elements, carried by the plate 11 of the diffuser 10, and suspension lines, connecting these attachment elements to the ceiling 4. By way of example, the attachment elements carried by the diffuser 10 are holes made on the peripheral edge of the plate 11 and the suspension lines are cables, passing through these holes and stretched between the plate 11 and the ceiling 4.

[0036] Taking into account the explanations given so far, it is understood that as long as terminal unit 1 does not have to be put into service, particularly when terminal unit 1 is stored and transported before being put into service, its handling is easy by maintaining its envelope 21 in the contracted configuration, as on the figure 4Furthermore, since the assembly means 30 are reversible, the diffuser 10 and the plenum 20 can be transported separately, further improving the handling of the terminal unit 1. The diffuser 10 and the plenum 20 can then be assembled only shortly before the terminal unit 1 is commissioned, particularly at the commissioning site, i.e., in building 2 in the example considered here, as this assembly is quick and easy. During the installation of the terminal unit 1 in room 3, the diffuser 10 and / or the plenum 20 are suspended from the ceiling 4 by the hanging means 50. The corresponding installation operations are facilitated, among other things, by the low weight of the terminal unit 1 and the ease of connection between the sleeve 23 and the ventilation duct 5.If necessary, the terminal unit 1 is installed in a free space separating the ceiling 4 and a false ceiling in room 3, so that, after installation, the plate 11 of the diffuser 10 extends continuously in the plane formed by this false ceiling. Due to its flexible structure, the casing 21 easily adapts to the free space between the ceiling 4 and the aforementioned false ceiling, even when this free space is small and / or cluttered. Once the terminal unit 1 is in service, it is aesthetic, in the sense that the outer face 13 of the plate 11 of its diffuser 10 meets the visual standards of the market, in particular in the presence of a false ceiling, and it is efficient in terms of aerodynamics, in the sense that the envelope 21 of its plenum 20 ensures a good distribution of air with respect to its diffuser 10 which, for its part, ensures a good diffusion of air through its plate 11.Terminal unit 1 also performs well in terms of acoustics, in that, thanks to its flexible structure, the envelope 21 attenuates noises coming from the ventilation duct 5.

[0037] It should be noted that, in operation, terminal unit 1 can be used with either a positive pressure or negative pressure ventilation system. When the ventilation system is under positive pressure, the ventilation duct 5 supplies terminal unit 1 with pressurized air which fills the internal volume V21 before being exhausted into room 3 of building 2 through plate 11, which tends, by inflation effect, to pass through and maintain the envelope 21 in its deployed configuration.When the ventilation network is under negative pressure, the ventilation duct 5 draws air from room 3 through terminal unit 1, by means of air circulation through plate 11 and then into internal volume V21: to counteract the suction effect prevailing in internal volume V21 and to prevent the latter from tending to make the envelope 21 take its contracted configuration while terminal unit 1 is in operation, terminal unit 1 advantageously includes holding means 60 which allow the envelope 21 to be maintained in the deployed configuration, including during a depressurization of the internal volume V21, while being able to be neutralized to switch the envelope 21 from the deployed configuration to the contracted configuration.

[0038] In practice, several forms of embodiment are conceivable for the support means 60. One possibility is that these support means 60 include all or part of the attachment means 50 as long as the latter act on the plenum 20: in the example considered in the figures, this amounts to saying that the support means 60 include the attachment elements 51 and the hangers 52 as long as the latter, by virtue of their fixed length once they are stretched between the ceiling 4 and the attachment elements 51, tend to counter the contraction of the envelope 21 in the deployed configuration, while, once the hangers 52 are released, neither the hangers 52 nor the attachment elements 51 prevent the envelope 51 from passing into the contracted configuration.Another possibility, which is potentially cumulative with the previous one but is not shown in detail in the figures, consists of the support means 60 including a flexible frame which is attached to the envelope 21 in a removable manner: this flexible frame, including for example one or more elastic hoops which are attached in dedicated sleeves of the envelope 21, acts mechanically on the envelope 21 to counter the contraction of this envelope in deployed configuration, this frame being then neutralizable by release to allow the envelope 21 to be returned to the contracted configuration.

[0039] Finally, various modifications and variations to terminal unit 1 described so far are also conceivable. For example, rather than being connected to a single ventilation duct, such as ventilation duct 5 on the figures 1 to 3, terminal unit 1 can be connected to several ventilation ducts, provided that its plenum 20 includes several sleeves, individually similar to sleeve 23 but opening into the internal volume V21 of its envelope 21 through as many respective openings, individually similar to opening 22B.

Claims

1. Terminal air handling unit (1) for a building (2), which terminal unit comprises a rigid diffuser (10) and a flexible plenum (20), as well as assembly means (30) which securely join the diffuser and plenum to one another, the diffuser (10) comprises a plate (11) which: - is made up of a primary material, - has two flat faces, opposite each other, namely an inner face (12), which faces the plenum (20), and an outer face (13), - is adapted to extend continuously in a plane formed by a false ceiling when the terminal unit (1) is installed in a free volume separating a ceiling (4) and said false ceiling, and - is perforated by air deflection passages (14) which connect the inner and outer faces to each other, and which plenum (20) comprises a casing (21) which: - defines an air distribution volume (V21), - is made of a second material that is more flexible than the first material and that is manually deformable so as to allow the envelope to be reversibly moved between a deployed configuration and a contracted configuration, the air distribution volume (V21) being greater when the envelope is in the deployed configuration than when the envelope is in the contracted configuration, - includes a main body (22) which closes off the air distribution volume (V21) except at least two through openings in the main body, namely a first opening (22A), which is covered by the inner face (12) of the plate (11), and a second opening (22B), and - also includes a sleeve (23) which extends lengthwise from the main body (22) outside the air distribution volume (V21) between two opposite longitudinal ends of the sleeve, namely a first end (23A), which is fitted to the second opening (22B), and a second end (23B), which is adapted to be connected to a ventilation duct (5).

2. A terminal unit according to claim 1, wherein the first material comprises or consists of a metallic material and / or a plastic material.

3. A terminal unit according to one of claims 1 or 2, wherein the second material comprises or consists of a textile material.

4. A terminal unit according to any one of the preceding claims, wherein the second material comprises or consists of a non-textile material.

5. A terminal unit according to any one of the preceding claims, wherein the second material is: - washable, and / or - non-flammable, and / or - an air-purifying material, in particular having antibacterial, antifungal, virucidal and / or pollutant-removing properties.

6. A terminal unit according to any one of the preceding claims, in which the envelope (21) results from the assembly of a plurality of parts having respective structures which are different from or identical to one another.

7. A terminal unit according to any one of the preceding claims, wherein the assembly means (30) reversibly assemble the diffuser (10) and the plenum (20) to one another.

8. A terminal unit according to any one of the preceding claims, wherein the assembly means (30) comprise: - one or more elements (31), which are carried by the diffuser (10) and which are arranged on a peripheral portion of the inner face (12) of the plate (11), within which the air deflection passages (14) are located, and - one or more second elements (32), which are carried by the plenum (20), which are arranged on an edge of the first opening (22A), and which cooperate with the one or more first elements (31) so as to fixedly assemble the diffuser (10) and the plenum (20) to one another.

9. A terminal unit according to claim 8, wherein the first (31) and second (32) elements are textured strips of hooks and loops, respectively, forming a hook-and-loop fastening system.

10. A terminal unit according to any one of the preceding claims, in which the second end (23B) of the sleeve (23) is provided with an elastic fixing collar (24) which is adapted, by elastic deformation, to be fitted around and clamp the ventilation duct (5).

11. A terminal unit according to any one of the preceding claims, in which the plenum (20) comprises an air filtration sleeve (40), which is arranged inside the air distribution volume (V21) and which is fixed, in particular removably, to the main body (22) by extending lengthwise in the longitudinal extension of the sleeve (23) between two opposite longitudinal ends of the sleeve, namely a first end (40A), which is fitted to the second opening (22B), and a second end (40B), which is closed.

12. A terminal unit according to any one of the preceding claims, wherein the terminal unit (1) comprises: - first suspension means, which are adapted to suspend the diffuser (10) from a ceiling (4) and which comprise first attachment elements, carried by the plate (11), and first hangers, connecting the first attachment elements to the ceiling, and / or - second attachment means (50), which are adapted to suspend the plenum (20) from a ceiling (4) and which comprise second attachment elements (51), carried by the casing (21), and second hangers (52), connecting the second attachment elements to the ceiling.

13. A terminal unit according to any one of the preceding claims, wherein the terminal unit (1) comprises holding means (60) which are adapted to: - maintain the shape of the envelope (21) in the deployed configuration, including when the air distribution volume (V21) is depressurised, and - be neutralised to change the envelope from the deployed configuration to the contracted configuration and in which, preferably, the holding means (60) comprise the second hooking means (50).

14. A terminal unit as claimed in claim 13, in which the retaining means comprise a flexible frame which is removably attached to the envelope (21).

15. A terminal unit according to any one of the preceding claims, wherein the main body (22) has a generally parallelepiped shape or a truncated pyramid shape.

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