Linear air diffuser

Abstract

A linear air diffuser (1), which comprises a box-like body (2) composed of lateral profiles (3a, 3b) for flow redirection blades or slats or deflectors or baffles (4a, 4b) and stopper plugs (6a, 6b). The diffuser is provided with spacers (12) provided with interconnection means (14a, 14b, 14c, 14d) and with means for locking (18) their selective position with respect to said lateral profiles (3a, 3b).

Description

[0001] The present invention relates to a diffuser of hot / cold air, linear in shape, for the air-conditioning of rooms.

[0002] Nowadays, conventional air diffusers are used to distribute air uniformly within a room and they are usually made up of a box-like body composed of lateral profiles for shutters or flow redirection blades or slats or deflectors (or baffles) and stopper plugs.

[0003] Characteristically, this type of diffuser is long and narrow, and is often integrated in floors, walls or ceilings, contributing to an effective distribution of air without compromising the appearance of the room.

[0004] Nowadays the market offers a wide range of linear diffusers, generally made of ferrous materials, aluminum, and alloys, which achieve this objective.

[0005] There are many configurations offered on the market in terms of dimensions and flow adjustment, which occurs by way of adjustable slats that can be oriented to control the direction of the air flow, allowing tailored adjustment of the distribution of the air on the basis of the specific needs of the room.

[0006] Linear air diffusers can be installed in various ways, including recessed in the floor or in the ceiling, or externally to the wall, making the presence of a grille in the front more noticeable.

[0007] For an in-wall linear diffuser, the only thing visible is the air exit slit.

[0008] Diffusers can have multiple parallel outlets, depending on the amount of air the room needs to heat / cool the space.

[0009] This flexibility of installation allows greater adaptability to different space configurations.

[0010] Conventional diffusers can be provided, as standard or as an option, with integrated air flow adjustment systems, allowing precise control of the amount of air diffused into the environment.

[0011] Such conventional diffusers have a number of drawbacks, such as the fact that they are predominantly made of extruded aluminum, which increases the overall weight of the product and increases its cost and installation times.

[0012] In addition it has been observed that the material used leads to the formation of condensation, which negatively affects the functionality of the diffuser and necessitates maintenance.

[0013] The main aim of the present invention is therefore to resolve the abovementioned technical problems, eliminating the drawbacks in the cited known art and hence devising a linear diffuser that offers a combination of performance in terms of lightness, ease of installation, anti-condensation performance and design.

[0014] Within this aim, an object of the invention is to provide an invention that offers a reduced overall weight.

[0015] Another object of the invention is to provide a linear air diffuser that requires low maintenance.

[0016] Another object of the invention is to provide a linear air diffuser that is structurally rigid.

[0017] Another object of the invention is to provide a linear air diffuser that makes it possible to obtain a uniform and controlled distribution of the air in the room.

[0018] Another object is to obtain a linear air diffuser that can be configured in a rapid and simple manner as a function of the amount of air that it is desired to handle.

[0019] Another object is to provide a linear air diffuser that, in addition to the foregoing characteristics, is also low cost, it being possible to make it with usual and conventional machinery and plants.

[0020] This aim and these and other objects which will become more apparent hereinafter are achieved by a linear air diffuser, which comprises a box-like body composed of lateral profiles for flow redirection blades or slats or deflectors or baffles and stopper plugs, characterized in that it has spacers provided with interconnection means and with means for locking their selective position with respect to said lateral profiles.

[0021] Further characteristics and advantages of the invention will become more apparent from the detailed description of a particular, but not exclusive, embodiment, illustrated by way of non-limiting example in the accompanying drawings wherein: Figure 1 is a perspective view from above of an in-wall diffuser; Figure 2 is a perspective view from below of the linear air diffuser according to the present invention; Figure 3 is an exploded view of the linear air diffuser of the invention; Figure 4 is a partially cross-sectional view of the linear air diffuser of the invention, taken transversely; Figure 5 is an exploded view of a component of the linear air diffuser of the invention; Figure 6 shows a component of the linear air diffuser of the invention of the previous figure, assembled; Figure 7 is a view, taken along a transverse cross-sectional plane, of the linear air diffuser of the invention with some components removed and in the condition in which the spacer is locked; Figure 8 is a view similar to the previous figure with some components applied, and in the condition in which a spacer element is released; Figure 9 is an additional perspective view from above of the linear air diffuser of the invention; Figure 10 is a view similar to the previous figure of the linear air diffuser of the invention, with a screen applied and without shutters or redirection blades; Figure 11 is a cross-sectional view of the linear air diffuser of the invention of the previous figure, with shutters associated with it; Figure 12 is an exposed diffuser with a different arrangement of components associated with it; Figure 13 shows the diffuser with motors applied; Figure 14 is a view similar to the previous figure, with the motors disconnected from the diffuser; Figure 15 is a cross-sectional view taken along a longitudinal plane of a detail of the coupling of the motor to the diffuser.

[0022] In the embodiments illustrated, individual characteristics shown in relation to specific examples may in reality be interchanged with other, different characteristics, existing in other embodiments.

[0023] With reference to the figures, the reference numeral 1 designates a linear air diffuser, in Figure 1 of the concealed type but also of the exposed type, which can be installed flush with the floor, the wall or the ceiling.

[0024] The diffuser 1 comprises a box-like body 2 composed of lateral profiles 3a, 3b for flow redirection blades or slats or deflectors or baffles 4a, 4b or a moving redirection blade 26 and stopper plugs 6a, 6b.

[0025] The linear air diffuser 1 is provided, for example, using, for some of its components, drawn PVC (polyvinyl chloride) or recycled PVC or ABS (Acrylonitrile Butadiene Styrene) or other materials adapted to extrusion, in order to render it simultaneously lightweight, strong and easily workable overall.

[0026] PVC also offers resistance to corrosion, thus making it suitable for corrosive or high-humidity environments.

[0027] Furthermore, plastic material is not subject to the formation of condensation on its surface in the event of an appreciable temperature difference, as is the case with conventional linear diffusers.

[0028] The lateral profiles 3a, 3b, which when deployed are arranged facing mirror-symmetrically toward each other, can on the other hand be made of extruded aluminum, defining a wall 7a, 7b from each of which a wing 8a, 8b protrudes outward in a lower region and abuts against a covering 9 of a wall or of a ceiling (not shown) in a region adjacent to a first opening 10 provided thereon.

[0029] The walls 7a, 7b are preferably made of plastic material, such as PVC or ABS, or of extruded aluminum.

[0030] The opening 10 has dimensions that are such as to allow the passage of the air flow from the linear air diffuser 1 into the room in which it is placed.

[0031] From the walls 7a, 7b below the wings 8a, 8b and in the direction of the interspace between those same walls 7a, 7b, once the linear air diffuser 1 is assembled, first tabs 11a, 11b protrude which have an advantageously concave shape with the concavity directed upward.

[0032] The linear air diffuser 1 comprises one or more spacers 12 which are interposed transversely to the walls 7a, 7b.

[0033] The number and arrangement and dimension of the spacers 12 will be such as to ensure the stability and the correct position of the linear air diffuser 1 in the wall or in the ceiling.

[0034] The spacers 12 are preferably made of plastic material, such as PVC or ABS.

[0035] Each spacer 12 is constituted by a body 13 shaped substantially like a parallelepiped which is substantially H-shaped in longitudinal cross-section, arranged horizontally, which comprises second interconnection means and means for locking to the lateral profiles 3a, 3b.

[0036] The second interconnection means are constituted by two pairs of ledges 14a, 14b, 14c, 14d, the terminal ends of which protrude from the body 13 and are positionable at complementarily-shaped first seats 15a, 15b, 15c, 15d which are present on the inner lateral surface 16a, 16b of the walls 7a, 7b.

[0037] Advantageously, each one of the two pairs of ledges 14a, 14b, 14c, 14d has mutually opposite inclined planes 17a, 17b, 17c, 17d which are adapted to stabilize the connection of the body 13 to the walls 7a, 7b.

[0038] Advantageously, the pair of ledges 14a, 14c protrudes from the body 13 to a lesser extent than that of the pair of ledges 14b, 14d.

[0039] The means for locking the selective position of the spacers 12 with respect to the lateral profiles 3a, 3b are constituted by an eccentric pin 18 which can be inserted into an adapted second seat 19 provided longitudinally to the body 13 of the spacer 12 in an intermediate region between the two pairs of ledges 14a, 14b, 14c, 14d.

[0040] The pin 18, which is substantially cylindrical, is provided at the ends with engagement means constituted by second tabs 20a, 20b which are substantially T-shaped and the shank 21a, 21b of which protrudes axially from the body 13 and the head 22a, 22b of which has a diameter that is such as to allow it to be positioned and rotated within the second seat 19.

[0041] The length of the pin 18 is greater than the length of the body 13 so that the second tabs 20a, 20b protrude, once the pin 18 is inserted in the second seat 19, into a region comprised between the two pairs of ledges 14a, 14b, 14c, 14d.

[0042] The second tabs 20a, 20b interact with grip means constituted by third seats 23a, 23b which are provided on the inner lateral surfaces 16a, 16b of the walls 7a, 7b.

[0043] The third seats 23a, 23b are provided longitudinally and for the entire length of the walls 7a, 7b and, in cross-section, are shaped complementarily to the heads 22a, 22b so as to allow the insertion of the latter into the third seats 23a, 23b thus allowing the axial movement of the spacers 12 up to the chosen position.

[0044] Approximately in the central region of the pin 18 and of the body 13, a through hole 24 and a slot 25 are respectively provided.

[0045] The slot has dimensions that are such as to allow, once the pin 18 is inserted in the body 13 and makes the heads 22a, 22b protrude from it, the through hole 24 to be seen and to allow, by means of a tool, such as a screwdriver or an Allen key which is inserted temporarily therein, the pin 18 to be rotated so as to create interference between said heads 22a, 22b and the third seats 23a, 23b and enable the spacer 12 to be locked by friction between the components.

[0046] The function of the body 13 of the spacer 12 is therefore to space the walls 7a, 7b apart, while the pin 18 makes it possible to lock the body 13 at the desired point of the walls 7a, 7b proper.

[0047] The spacers 12 further comprise first means adapted to allow selective interconnection for flow redirection blades and / or slats and / or deflectors and / or baffles 4a, 4b and / or at least one moving redirection blade 26, the first means being constituted by a pair of fourth seats 27a, 27b and by a fifth seat or central guide 28, which are provided below the body 13 in a region below the positioning of the pin 18 and along an axis that is substantially transverse thereto.

[0048] Advantageously, the fourth seats 27a, 27b are provided at a region underlying the pair of ledges 14b and 14d while the fifth seat or central guide 28 is provided at a median axis which is transverse to the body 13 in a region underlying the slot 25.

[0049] Each one of the fourth seats 27a, 27b and fifth seat or central guide 28 is, in plan view, shaped substantially like an upturned U, and at these it is possible to associate, for example by snap action or by axial insertion, in a removable and articulatable manner, so that it can oscillate and be removed, a first end 29 of the flow redirection blades and / or slats and / or deflectors and / or baffles 4a, 4b and / or moving redirection blade 26.

[0050] The shape structure of the flow redirection blades and / or slats and / or deflectors and / or baffles 4a, 4b is substantially of the laminar type, defining a curved flap that protrudes radially from the first ends 29, the flap having an inclination that is substantially equal to that of the first tabs 11a, 11b and a length that is such as to arrange the respective second free ends 30 adjacent to a second opening 31 defined below the box-like body 2 which is positioned, in use, at the opening 10 provided in the covering 9.

[0051] The longitudinal extension of the flow redirection blades and / or slats and / or deflectors and / or baffles 4a, 4b and / or at least one moving redirection blade 26 and of the first ends 29 may vary as a function of the specific requirements and therefore, for example, cover the entire length of the first opening 10 or part of it, and in the latter case the flow redirection blades and / or slats and / or deflectors and / or baffles 4a, 4b and / or at least one moving redirection blade 26 can be made up of several elements arranged mutually contiguously.

[0052] The at least one moving redirection blade 26 is substantially teardrop-shaped so as to define a tip 32 that, as shown for example in Figure 8, can oscillate in the space comprised between the free ends of the first tabs 11a, 11b at the second opening 31.

[0053] The teardrop shape of the at least one moving redirection blade 26 is adapted to prevent it from posing an impediment to the outflow of the air and to facilitate the directing of the air.

[0054] The at least one moving redirection blade 26 can consist of a single element or it may be composed of multiple elements, arranged mutually sequentially and optionally also with mutually different shapes, so as to be able to direct the conditioned air at different points within the same linear air diffuser 1.

[0055] The at least one moving redirection blade 26 can be associated with at least one LED lighting strip 33 of suitable length which can be arranged at a chosen point thereof.

[0056] The flow redirection blades and / or slats and / or deflectors and / or baffles 4a, 4b and / or at least one moving redirection blade 26 are moved, in the same direction or in different directions, manually or by way of at least one motor 34, which is associated with one or both of the stopper plugs 6a, 6b.

[0057] The motor 34, of known type, has a transmission shaft 35 which is keyed to a coupling 36 which in turn has an axial secondary shaft 37 which is keyed to an adapted axial sixth seat 38 provided at the first end 29 of the flow redirection blades and / or slats and / or deflectors and / or baffles 4a, 4b and / or of the at least one moving redirection blade 26.

[0058] Figure 12 shows a linear air diffuser 1 of the exposed type, for example without the flow redirection blades and / or slats and / or deflectors and / or baffles 4a, 4b, but with a box-like body 3 having a shape that is transversely duplicated, and therefore comprising a central profile 39 interposed between the walls 7a, 7b.

[0059] The central profile 39 is constituted substantially by a coupling of two of the walls 7a, 7b so as to allow the positioning, respectively between the wall 7a and the central profile 39 and between the wall 7b and the central profile 39, of two distinct spacers 12 arranged mutually axially aligned.

[0060] Effectively, therefore, the arrangement shown in Figure 4 is reiterated, flanking it with another of the same kind so as to double the flow of air to be handled.

[0061] There are also optionally shutters 40a, 40b for adjusting the air flow, which are arranged so that they can slide between the upper ends of the walls 7a, 7b, the shutters 40a, 40b having a substantially laminar shape with adapted third openings 41 which can be partially or wholly superimposed on each other.

[0062] Figures 10 and 11 illustrate a solution in which the moving redirection blade 26 is not used; in this case a screen 42 is used to conceal the fifth seat or central guide 28.

[0063] Thus it has been found that the invention fully achieves the intended aim and objects, a linear diffuser having been devised that offers a combination of high performance in terms of lightness, anti-condensation performance, design and ease of installation and maintenance.

[0064] At the same time the linear diffuser offers a high degree of rigidity, and makes it possible to achieve a uniform and controlled distribution of the air in the environment.

[0065] The use of at least one moving redirection blade 26 hinged to the body 13 makes it possible to direct the air where necessary, as it is also possible to easily move it by hand or using the motor 34.

[0066] The ability to select the locking points of the spacers 12 makes it possible to configure the diffuser in a rapid and simple manner as a function of the amount of air that it is desired to handle.

[0067] The invention thus conceived is susceptible of numerous modifications and variations, all of which are within the scope of the appended claims.

[0068] Thus there may or may not be, or there may be in different mutual combinations, shutters or flow redirection blades or slats or deflectors or baffles or moving redirection blades.

[0069] Similarly the shape, number and arrangement of the flow redirection blades or slats or deflectors or baffles 4a, 4b and of the moving redirection blades 26 can be varied according to specific requirements.

[0070] The materials used, as well as the dimensions that constitute the individual components of the invention, may of course be more pertinent according to the specific requirements.

[0071] The various means of achieving certain different functions certainly need not coexist only in the embodiment shown, but may be present in many embodiments, even if they are not shown.

[0072] The characteristics indicated above as advantageous, convenient or the like, may also be missing or be substituted by equivalent characteristics.

[0073] The disclosures in Italian Utility Model Application No. 202024000002152 from which this application claims priority are incorporated herein by reference.

[0074] Where technical features mentioned in any claim are followed by reference signs, those reference signs have been included for the sole purpose of increasing the intelligibility of the claims and accordingly, such reference signs do not have any limiting effect on the interpretation of each element identified by way of example by such reference signs.

Claims

1. A linear air diffuser (1), concealed or exposed, which comprises a box-like body (2) composed of lateral profiles (3a, 3b) for flow redirection blades or slats or deflectors or baffles (4a, 4b) and stopper plugs (6a, 6b), characterized in that it has spacers (12) provided with interconnection means (14a, 14b, 14c, 14d) and means for locking (18) their selective position with respect to said lateral profiles (3a, 3b).

2. The diffuser (1) according to claim 1, characterized in that said spacers (12) comprise first means adapted to enable the selective interconnection of said flow redirection blades and / or slats and / or deflectors and / or baffles (4a, 4b) and / or at least one moving redirection blade (26).

3. The diffuser (1) according to claim 2, characterized in that said first means adapted to enable selective interconnection comprise a seat or a central guide (28) for the interconnection of at least one moving redirection blade (26).

4. The diffuser (1) according to claim 3, characterized in that said at least one moving redirection blade (26) is provided with at least one LED lighting strip (33).

5. The diffuser (1) according to one or more of the preceding claims, characterized in that said flow redirection blades and / or slats and / or deflectors and / or baffles (4a, 4b) and / or at least one moving redirection blade (26) are moved, in the same direction or in different directions, manually or by way of at least one motor (34).

6. The diffuser (1) according to claim 1, characterized in that said means for locking (18) are of the eccentric type.

7. The diffuser (1) according to one or more of the preceding claims, wherein said lateral profiles (3a, 3b), which when deployed are arranged facing mirror-symmetrically toward each other, are adapted to define a wall (7a, 7b) from each of which a wing (8a, 8b) protrudes outward in a lower region and abuts against a covering (9) of a wall or of a ceiling in a region adjacent to a first opening (10) provided thereon and with dimensions that are such as to allow the passage of the air flow from said linear air diffuser (1) into the room in which it is placed, characterized in that, once assembled, in the interspace between said walls (7a, 7b), below said wings (8a, 8b), first tabs (11a, 11b) protrude which have a concave shape with the concavity directed upward.

8. The diffuser (1) according to one or more of the preceding claims, characterized in that each one of said spacers (12) is constituted by a body (13) shaped substantially like a parallelepiped which is substantially H-shaped in longitudinal cross-section, arranged horizontally, which comprises said interconnection means (14a, 14b, 14c, 14d) and said means for locking (18) to said lateral profiles (3a, 3b).

9. The diffuser (1) according to one or more of the preceding claims, characterized in that said interconnection means are constituted by two pairs of ledges (14a, 14b, 14c, 14d), the terminal ends of which protrude from said body (13) and are positionable at complementarily-shaped first seats (15a, 15b, 15c, 15d) which are present on the inner lateral surface (16a, 16b) of said walls (7a, 7b).

10. The diffuser (1) according to one or more of the preceding claims, characterized in that each one of said two pairs of ledges (14a, 14b, 14c, 14d) has mutually opposite inclined planes (17a, 17b, 17c, 17d) which are adapted to stabilize the connection of said body (13) to said walls (7a, 7b).

11. The diffuser (1) according to one or more of the preceding claims, characterized in that said pair of ledges (14a, 14c) protrudes from said body (13) to a lesser extent than that of said pair of ledges (14b, 14d).

12. The diffuser (1) according to one or more of the preceding claims, characterized in that said means for locking the selective position of said spacers (12) with respect to said lateral profiles (3a, 3b) are constituted by an eccentric pin (18) which can be inserted into an adapted second seat (19) provided longitudinally to said body (13) of said spacer (12) in an intermediate region between said pairs of ledges (14a, 14b, 14c, 14d).

13. The diffuser (1) according to one or more of the preceding claims, characterized in that said pin (18), which is substantially cylindrical, is provided at the ends with engagement means constituted by second tabs (20a, 20b) which are substantially T-shaped and the shank (21a, 21b) of which protrudes axially from said body (13) and the head (22a, 22b) of which has a diameter that is such as to allow it to be positioned and rotated within said second seat (19).

14. The diffuser (1) according to one or more of the preceding claims, characterized in that the length of said pin (18) is greater than the length of said body (13) so that said second tabs (20a, 20b) protrude, once said pin (18) is inserted in said second seat (19), into a region comprised between said two pairs of ledges (14a, 14b, 14c, 14d).

15. The diffuser (1) according to one or more of the preceding claims, characterized in that said second tabs (20a, 20b) interact with grip means constituted by third seats (23a, 23b) which are provided on said inner lateral surfaces (16a, 16b) of said walls (7a, 7b), said third seats (23a, 23b) being provided longitudinally and for the entire length of said walls (7a, 7b) and, in cross-section, being shaped complementary to said heads (22a, 22b) so as to allow the insertion of the latter into said third seats (23a, 23b) thus allowing the axial movement of said spacers (12) up to the chosen position.

16. The diffuser (1) according to one or more of the preceding claims, characterized in that, substantially in the central region of said pin (18) and of said body (13), a through hole (24) and a slot (25) are respectively provided, said slot (25) having dimensions that are such as to allow, once said pin (18) is inserted in said body (13) and makes said heads (22a, 22b) protrude from it, said through hole (24) to be seen and to allow, by means of a tool, such as a screwdriver or an Allen key which is inserted temporarily therein, said pin (18) to be rotated so as to create interference between said heads (22a, 22b) and said third seats (23a, 23b) and enable said spacer (12) to be locked by friction between the components.

17. The diffuser (1) according to one or more of the preceding claims, characterized in that the function of said body (13) of said spacer (12) is to space said walls (7a, 7b) apart, while said pin (18) makes it possible to lock said body (13) at the desired point of said walls (7a, 7b) proper.

18. The diffuser (1) according to one or more of the preceding claims, characterized in that said spacers (12) comprise first means adapted to allow selective interconnection for said flow redirection blades and / or slats and / or deflectors and / or baffles (4a, 4b) and / or at least one moving redirection blade (26), said first means being constituted by a pair of fourth seats (27a, 27b) and by a fifth seat or central guide (28), which are provided below said body (13) in a region below the position of said pin (18) and along an axis that is substantially transverse thereto.

19. The diffuser (1) according to one or more of the preceding claims, characterized in that said fourth seats (27a, 27b) are provided at a region underlying said pair of ledges (14b, 14d) while said fifth seat or central guide (28) is provided at a median axis which is transverse to said body (13) in a region underlying said slot (25).

20. The diffuser (1) according to one or more of the preceding claims, characterized in that each one of said fourth seats (27a, 27b) and fifth seat or central guide (28) is, in plan view, shaped substantially like an upturned U, it being possible to articulate at these, so that it can oscillate and be removed, a first end (29) of said flow redirection blades and / or slats and / or deflectors and / or baffles (4a, 4b) and / or moving redirection blade (26).

21. The diffuser (1) according to one or more of the preceding claims, characterized in that the shape structure of said flow redirection blades and / or slats and / or deflectors and / or baffles (4a, 4b) is substantially of the laminar type, defining a curved flap that protrudes radially from said first ends (29), said flap having an inclination that is substantially equal to that of said first tabs (11a, 11b) and a length that is such as to arrange the respective second free ends (30) adjacent to a second opening (31) defined below said box-like body (2) which is positioned, in use, at said opening (10) provided in said covering (9).

22. The diffuser (1) according to one or more of the preceding claims, characterized in that the longitudinal extension of said flow redirection blades and / or slats and / or deflectors and / or baffles (4a, 4b) and / or at least one moving redirection blade (26) and of said first ends (29) covers the entire length of said first opening (10) or part of it, in the latter case said flow redirection blades and / or slats and / or deflectors and / or baffles (4a, 4b) and / or at least one moving redirection blade (26) being made up of several elements arranged mutually contiguously.

23. The diffuser (1) according to one or more of the preceding claims, characterized in that said at least one moving redirection blade (26) is substantially teardrop-shaped so as to define a tip (32) that oscillates in the space comprised between the free ends of said first tabs (11a, 11b) at said second opening (31).

24. The diffuser (1) according to one or more of the preceding claims, characterized in that said at least one moving redirection blade (26) consists of a single element or is composed of multiple elements, arranged mutually sequentially and optionally also with mutually different shapes, so as to be able to direct the conditioned air at different points within the same linear air diffuser (1).

25. The diffuser (1) according to one or more of the preceding claims, characterized in that said at least one moving redirection blade (26) can be associated with at least one LED lighting strip (33) of suitable length which can be arranged at a chosen point thereof.

26. The diffuser (1) according to one or more of the preceding claims, characterized in that said flow redirection blades and / or slats and / or deflectors and / or baffles (4a, 4b) and / or at least one moving redirection blade (26) are moved, in the same direction or in different directions, manually or by way of at least one motor (34), which is associated with one or both of said stopper plugs (6a, 6b).

27. The diffuser (1) according to one or more of the preceding claims, characterized in that said motor (34) has a transmission shaft (35) which is keyed to a coupling (36) which in turn has an axial secondary shaft (37) which is keyed to an adapted axial sixth seat (38) provided at said first end (29) of said flow redirection blades and / or slats and / or deflectors and / or baffles (4a, 4b) and / or of said at least one moving redirection blade (26).

28. The diffuser (1) according to one or more of the preceding claims, characterized in that it is of the exposed type and in that it comprises a box-like body (3) which comprises a central profile (39) interposed between said walls (7a, 7b) so as to define, transversely, a side-by-side arrangement for two distinct spacers (12) positionable thereat.

29. The diffuser (1) according to one or more of the preceding claims, characterized in that said central profile (39) is constituted substantially by a coupling of two of said walls (7a, 7b) so as to allow the positioning, respectively between said wall (7a) and said central profile (39) and between said wall (7b) and said central profile (39), of two distinct spacers (12) arranged mutually axially aligned.

30. The diffuser (1) according to one or more of the preceding claims, characterized in that it has shutters (40a, 40b) for adjusting the air flow which are arranged so that they can slide between the upper ends of said walls (7a, 7b), said shutters (40a, 40b) having a substantially laminar shape with adapted third openings (41) which can be partially or wholly superimposed on each other.

31. The diffuser (1) according to one or more of the preceding claims, characterized in that it is made using, for some of its components, drawn PVC (polyvinyl chloride) or recycled PVC or ABS (Acrylonitrile Butadiene Styrene) or drawn aluminum.

32. The diffuser (1) according to one or more of the preceding claims, characterized in that said one or more spacers (12), which can be interposed transversely to said walls (7a, 7b), are made of plastic material, such as PVC or ABS.

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