Air ventilator with non-return valve and filter for leading replacement air into a room

Description

Field of the Invention

[0001] The present invention relates to an air ventilator which comprises a air inlet, an air outlet, and an air channel to enable air flow between the air inlet and the air outlet.

Background of the Invention

[0002] Air ventilators are known which can be used to input replacement air from outside to a room to improve the air quality in the room. Air ventilators are known which can be installed above a window, either in the frame of the window or in a narrow space (slit) just above the frame of the window. These kinds of air ventilators usually have an internal air channel for guiding the incoming air to a certain direction in the room when the air leaves the air ventilator. The direction is e.g. partly upwards and partly sidewards from the window so that the air flow is not perpendicular to the plane of the window. For example, the publication EP 0 801 275 discloses such an air ventilator which can be installed in a narrow slit above a window.

[0003] The above described air ventilators do not have fans or other means which would force the air to flow from outside to the room. The operation of such air ventilators is based on a pressure difference between the room and the outside air. When there is an underpressure in the room, that is, the air pressure in the room is lower than the pressure of the outside air, air flows through the air ventilator from outside to inside the room. The underpressure is typically generated in the room by an exhaust fan which suctions air from the room to outside. However, sometimes it may happen that the pressure difference between the room and the outside air becomes very low or it may even happen that the room will become overpressurized with respect to the outside i.e. the air pressure in the room is greater than the air pressure outside the room.

[0004] The publication EP 1 988 341 discloses a backflow protection apparatus for an air ventilator. The backflow protection apparatus prevents or reduces the amount of air flowing through the air ventilator from the room to the outside air.

[0005] The publication DE 10059077 discloses an input air pipe which incorporates at least two sound insulation components of acoustically pliable material, preferably of polymer or elastomer foam, spaced apart, turned through 180 degrees in relation to each other, extending vertically to the pipe axis and disk-shaped. The components locate with their peripheral surfaces (202) on the inner surface of the input air pipe (1), pressed by their own pressure, covering the pipe inner cross-sectional surface (Fi) to 55 to 65 per cent. The sound insulation components on the input air current side have at least one sound-absorbent plate (25) fully covered with the sound insulating material, of metal, and with a greater density than the sound insulating material.

[0006] The input air pipe has some kind of walls inside the air pipe to increase the length of the path which the air flowing through the pipe traverses inside the input air pipe. These kinds of walls greatly restrict the air flow because there are lot of sharp angles (90 degrees) in the path of the air flow. Furthermore, the cross sectional area of the air pipe is larger at the output of the air pipe than at the locations of the walls inside the air pipe thus reducing the speed of the air which comes out from the air pipe. Moreover, at the output of the air pipe there is a ventilation screen, which turns the direction of the air flow downwards thus easily causing a feeling of draft in the room.

[0007] One further drawback in the structure of the input air pipe of DE 10059077 is that the backflow trap is designed to rest in a vertical direction when there is no airflow in the input air pipe. Thus, it may happen that there is a small slit between the backflow trap and the wall to which the backflow trap should rest i.e. at the lower edge of the backflow trap. Therefore, it may be possible that small amounts of air can flow in the reversed direction because the backflow trap may not totally close the input of the input air pipe.

[0008] In the above types of air ventilators the height of the air channel is quite low which may affect that the air filters of the air ventilators may resist the air flow through the ventilator to the room. The filters are needed to prevent impurities of the air flow from entering the room.

Summary of the Invention

[0009] An aim of the present invention is to provide an air ventilator in which the filter has less resistance to the air flow compared to the air ventilators of prior art. The invention is based on the idea that the air channel of the air ventilator has a higher section in which the filter is positioned. Therefore, the cross section of the filter can be enlarged which reduces the resistive effect of the filter against the air flow but still keeping the filtering properties of the filter at an appropriate level.

[0010] According to a first aspect of the present invention there is provided an air ventilator which comprises the features of claim 1.

[0011] Preferred embodiments of the inventions are defined in the dependent claims.

[0012] According to a first advantageous embodiment of the present invention the second section comprises a sheet-like support for the backflow trap which reduces the cross section of the air channel in the second section to increase the speed of the air flowing out from the air ventilator and to maintain the sound absorption properties of the air ventilator at a good enough level.

[0013] The air ventilator according to the present invention improves the operation of air ventilators of prior art by keeping the overall air flow resistance of the air ventilator at a low level and still enabling good filtering properties and sound absorption properties. In addition, the backflow trap of the air ventilator is also operating at a very low pressure differences and still prevents or at least reduces the backflow through the air ventilator.

[0014] The air ventilator according to the present invention can be installed, for example, in a slit above a window or above a casing of a drawable blind curtain which can be installed above a window.

Description of the Drawings

[0015] In the following the present invention will be described in more detail with reference to the attached drawings in which

Fig. 1

depicts a wall of a room and an air ventilator installed in a slit above a window of the room,

Fig. 2

depicts a wall of a room and an air ventilator installed above a casing of a mechanism of a drawable curtain of a window of the room,

Fig. 3

depicts from the above a first embodiment of the air ventilator of the present invention and a cross-sectional side view of air ventilator at the location I-I,

Fig. 4

depicts a cross-sectional side view of the backflow trap according to the present invention installed in a slit above a window,

Fig. 5

depicts a cross-sectional side view of the first embodiment of the backflow trap according to the present invention installed above the casing of the mechanism of the draw curtain,

Figs. 6a-6c

depict some details of the operation of the backflow trap according to the present invention,

Fig. 7

shows as a perspective view an example of the backflow trap of the air ventilator, and

Fig. 8

shows a cross-sectional view of an inlet of the air ventilator according to another example embodiment of the present invention.

Detailed Description of the Invention

[0016] In the following, the structure of an example embodiment of an air ventilator 2 according to the present invention will be described in more detail with reference to Fig. 3. The air ventilator 2 comprises a air inlet 2.1 and one or more air channels 2.3 between the air inlet 2.1 and an air outlet 2.2. An example embodiment of the air channels 2.3 are shown in Fig. 3. The air inlet can comprise a wall 2.1.1 which protects the air ventilator 2 from water due to e.g. rain and also defines together with e.g. the window frame a perimeter of the air inlet.

[0017] The air ventilator has a first section 2.7 and a second section 2.8. The first section 2.7 comprises at least part of said one or more air channels 2.3. The first section 2.7 has a certain height h1 so that the air ventilator 2 can be installed above a window 3, e.g. in the narrow slit between the upper part of the window and the upper side of the opening which is made into the wall 4 of the room. The first section 2.7 comprises channelling means 2.9 for controlling the direction of the air flow in the air channel, the shape of the channelling means 2.9 is advantageously such that the air channels 2.3 diverge from each other in the direction of the air flow in the air channels 2.3 as can be seen from Fig. 3. However, the height of the channelling means 2.9 is advantageously not the same than the height of the first section 2.7 but slightly less. Although a small portion of the air flowing through the air ventilator 2 can traverse above the channelling means 2.9, it does not deteriorate the operation of the air ventilator but can even improve the operation of the air ventilator. This is due to the fact that a little bit more air can flow through the air ventilator 2 but still the direction of the flow which traverses in the air channels 2.3, i.e. in the space between the channelling means 2.9, determines the direction of the flow of the air at the air outlet 2.2.

[0018] The second section 2.8 of the air ventilator comprises the backflow trap 1 and the filter 5. The height h2 of the second section 2.8 is greater than the height h1 of the first section 2.7. This has the effect that the speed of the air flow slightly reduces but the cross section of the filter 5 can be made larger compared to the situation in which the height of the second section 2.8 were the same than the height of the first section 2.7. Hence, the filtering efficiency can be improved and the air flow resistance of the filter can be reduced.

[0019] The second section 2.8 also comprises a first support element 2.10 for the backflow trap 1. The first support element 2.10 is preferably a sheet like structure which is fixed to the upper wall 2.8.1 of the second section 2.8 so that no air can flow between the first support element 2.10 and the upper wall 2.8.1 of the second section 2.8. The length of the first support element 2.10 is advantageously the same or slightly less than the width w2 of the cross section of the second section 2.8. The first support element 2.10 has also the effect that the cross section of the air channel in the second section is reduced by the first support element 2.10. Preferably, the area of the cross section of the second section 2.8 is smaller at the location of the first support element 2.10 than at the location of the filter 9. Hence, the speed of the air flow increases before it leaves the air ventilator 2 via the air outlet 2.2. This prevents the air flow from turning downwards at or immediately after the air outlet 2.2. This kind of effect in which the air flow would turn downwards might cause a feeling of draft to persons which are in the room near the window 3. The air ventilator 2 of the present invention directs the air upwards, not downwards, so that the air flow traverses near the roof of the room before it begins to fall downwards farther from the window. Further, the structure of the air channel 2.3 inside the air ventilator makes the air flow spreading at least slightly sidewards further improving the distribution of the air inside the room wherein the air flow is not perpendicular with respect to the plane of the window.

[0020] The backflow trap 1 is a sheet like element preferably made of a thin plastic sheet or a thin metal sheet. The air channel in the air outlet 2.2 of the air ventilator 2 has a rectangular form in such a way that the height of the air channel is smaller than the width of the air channel. Therefore, the backflow trap 1 is a rectangular element so that the length of the backflow trap 1 is almost the same than the width of the air channel in the air outlet 2.2 of the air ventilator 2 and the width of the backflow trap 1 is greater than the height of the air channel in the air outlet 2.2 of the air ventilator 2. Hence, the backflow trap 1 can totally, or almost totally close the air channel inside the air outlet 2.2 of the air ventilator 2 to effectively prevent backflow through the air ventilator 2. This will be discussed in more detail below in this specification. An example of the backflow trap 1 is illustrated in Fig. 7.

[0021] The backflow trap 1 can be curved in the width direction of the backflow trap 1 i.e. the cross section of the backflow trap 1 is convex when looked at one narrower side of the backflow trap 1.

[0022] The second section 2.8 can also have a second support element 1.3 which can be used as a guidance for the installation of the backflow trap 1. The first 2.10 and the second support elements 2.11 also keep the backflow trap 1 in proper position with respect to the air channel of the air outlet 2.2 of the air ventilator 2. The first support element 2.10 prevents one edge 1.1 of the backflow trap 1 dropping down when the backflow protection apparatus 1 has been installed in the air outlet 2.2 of the air ventilator 2. The backflow trap 1 is adapted to be rotatable e.g. by tilting with respect to the first support element 2.10 by the air flowing from the air inlet 2.1 to the air outlet 2.2 of the air ventilator 2. Preferably, the backflow trap 1 is adapted to be movable between a first position and a second position. In the first position (Figs. 6a and 6c) the air channel of the outlet 2.2 of the air ventilator 2 is substantially closed and in the second position the air channel of the outlet 2.2 of the air ventilator 2 is open so that air can flow from the air channel 2.3 of the air ventilator 2 through the outlet 2.2. to the room.

[0023] Preferably, the backflow trap 1 is not fixed to the air ventilator 2, which enables the backflow trap 1 to move easily in the air ventilator 2. The backflow trap 1 can be installed to the air ventilator 2 at the manufacturing stage of the air ventilator 2. Therefore, the second support element 2.11 can prevent the backflow trap 1 from falling away from the air ventilator 2 when the air ventilator 2 is not yet installed to the wall. This can be achieved by, for example, using rivets as the second support elements 2.11 and drilling holes through the backflow trap 1 through which the rivets can be installed. The diameter of the holes is greater than the diameter of the rivets so that the rivets do not prevent the backflow trap 1 from moving between the first and the second position.

[0024] When the air pressure inside the room is lower than the outlet air pressure i.e. the room is underpressurized, the air flows from outside to the air channel 2.3 through the air inlet 2.1 or through the second air inlet 2.4. From the air channel 2.3 the air flows to the air outlet 2.2 and reaches the backflow trap 1 as shown by the arrow F1 in Fig. 6a. The force caused by air flow F1 makes the trailing edge 1.2 of the backflow trap 1 to rise thus opening the air channel of the air outlet 2.2.

[0025] In a situation in which the pressure difference between outside and indoors is almost zero, there is no air flow in the air ventilator 2, or the air flow is very weak. Hence, the backflow trap 1 returns to the rest position i.e. the trailing edge 1.2 is resting on the lower wall 2.8.2 of the second section 2.8 of the air ventilator 2. This closes the air channel of the air outlet 2.2 of the air ventilator 2. If the room becomes overpressurized, i.e. the air pressure in the room becomes greater than the air pressure outside, the air attempts to flow backwards (arrow F2 in Fig. 6c) from the air outlet 2.1 to the air inlet 2.1, 2.4. However, because the backflow trap 1 closes the air channel inside the air outlet 2.2, air cannot flow to the air channel 2.3 of the air ventilator 2 thus backflow is prevented. The curved form of the backflow trap 1 now improves the tightness of the backflow trap 1 because the air flow coming from the room in the air outlet 2.2 pushes the trailing edge 1.2 of the backflow trap 1 towards the lower wall 2.8.2 of the first support element of the air ventilator 2. The first support element 2.10 can be formed as a separate piece which is attached to the upper wall 2.8.1 of the second section 2.8 e.g. by rivets or by welding. In another embodiment the first support element 2.10 is formed by punching a U-shaped slit on the upper wall 2.8.1 of the second section 2.8 and then bending the U-shaped part of the wall so that it forms a kind of a shelf on which one edge of the backflow trap 1 can be supported. However, these are not the only possibilities to form the first support element 2.10 for the backflow trap 1.

[0026] The air ventilator 2 of the present invention can be installed in a slit above the window 3 i.e. between a window frame and the upper edge of the opening in the wall of the room as is disclosed in Figs. 1, 3 and 4. It is also possible that a slit is made to the window frame wherein the air ventilator 2 can also be installed in the slit of the window frame.

[0027] In some situations there may be a drawable curtain installed in front of the window, outside the room. This kind of curtain can be drawn ahead of the window to e.g. prevent sunlight entering the room. This kind of a curtain has a mechanism 10.2 inside a casing 10.1 which can be installed above the window 3 or which is a part of the window 3. Therefore, the air ventilator 2 of the present invention can also be installed directly at the top of the casing 10.1 of the curtain 10 as illustrated in Figs. 2 and 5.

[0028] In another embodiment the air inlet 2.1 of the air ventilator may also comprise channelling means (not shown) to provide some directionality to the air which enters the air ventilator.

[0029] In Fig. 8 yet another embodiment of the air inlet 2.1 of the air ventilator is depicted as a cross-sectional view. In this embodiment the air inlet 2.1 comprises a first wall 2.1.1 and a second wall 2.1.2 which define the peripheral for the air flow through the air inlet 2.1. The first wall 2.1.2 is nearer to the window than the second wall 2.1.2 and the cross section of the first wall 2.1.1 has an L-shape which forms preferably a 90 degrees angle a (i.e. a first angle) as can be seen from Fig. 8. The second wall 2.1.2, which is farther from the window, is also formed in such a way that the cross section of the second wall 2.1.2 has L-shape. However, the angle β of this L-shape (i.e. a second angle) is less than 90 degrees.

[0030] The air inlet 2.1 has a small overhang 2.1.3 preferably at the angle of the first wall 2.1.1. The overhang 2.1.3 is directed towards the second wall 2.1.2. This overhang 2.1.3 is provided to prevent or at least hinder water from entering the air channel 2.3 of the air ventilator through the air inlet 2.1. For example, when it is raining and windy, the wind may cause that rainwater may flow on the surface of the first wall 2.1.1 of the air inlet upwards. When rainwater hits the overhang 2.1.3, rainwater cannot easily circumvent the overhang 2.1.3.

[0031] The overhang 2.1.3 reduces the cross-sectional area of the air inlet at some amount. Therefore, the angle of the second wall 2.1.2 is preferably less than 90 degrees. Another purpose for the angle being less than 90 degrees is to further hinder water entering the air channel 2.3 of the air ventilator 2.1.

[0032] In the following some non-limiting examples of some dimensions of the air ventilator 2 of the present invention are provided. For example, the dimension of the air inlet 2.1 is about 9 mm in horizontal direction and 300-1800 mm in vertical direction, preferably 9 mm x 600 mm. The height of the first section 2.7 i.e. the first height h1 is, for example, 9 mm and the height of the second section 2.8 i.e. the second height h2 is, for example, 12 mm. The protrusion of the overhang 2.1.3 is preferably between 3 and 5 mm. It is obvious that the invention is not limited to these dimensions but also other dimensions are applicable.

Claims

1. An air ventilator (2) which comprises

- an air inlet (2.1),

- an air outlet (2.2),

- an air channel (2.3) to enable air flow between the air inlet (2.1) and the air outlet (2.2),

- a backflow trap (1) for preventing air flowing to a backwards direction in the air channel (2.3),

- a first section (2.7) comprising channelling means (2.9) for controlling the direction of the air flow in the air channel (2.3), and said first section (2.7) having a first height (h1); and

- a second section (2.8) comprising a first support element (2.10) for supporting a first edge (1) of the backflow trap (1),

characterised in that the second section (2.8) of the air ventilator (2) further having a second height (h2) which is higher than the first height (h1), and the second section (2.8) comprises a filter (9) for filtering impurities from the air flowing through the air channel (2.3);
wherein the area of the cross section of the second section (2.8) is smaller at the location of the first support element (2.10) than at the location of the filter (9) to increase the speed of the air flow before it leaves the air ventilator (2) via the air outlet (2.2).

2. An air ventilator (2) according to claim 1, characterised in that the backflow trap (1) is adapted to be tiltable by air flowing from the air inlet (2.1) to the air outlet (2.2) of the air ventilator (2).

3. An air ventilator (2) according to claim 1 or 2, characterised in that the height of the channelling means (2.9) is smaller than the height of the first section (2.7) to enable a small portion of the air flowing through the air ventilator (2) traverse above the channelling means (2.9).

4. An air ventilator (2) according to claim 1, characterised in that the length of the first support element (2.10) is equal to the width (w2) of the second section (2.8).

5. An air ventilator (2) according to any of the claims 1 to 4, characterised in that the backflow trap (1) is adapted to be movable between a first position, in which the air channel of the outlet (2.2) of the air ventilator (2) is closed, and a second position, in which the air channel of the outlet (2.2) of the air ventilator (2) is open, wherein in the first position a trailing edge (1.2) the backflow trap (1) is adapted to rest on the lower wall (2.8.2) of the second section (2.8).

6. A window (3) comprising an air ventilator (1) according to any of the claims 1 to 5.

7. A window (3) according to claim 6, characterised in that the window (3) comprises a curtain (10) having a casing (10.1), wherein the air ventilator (2) is fixed on top of the casing (10.1).

8. A window (3) according to any of the claims 6 or 7, characterised in that the air inlet (2.1) comprises a first wall (2.1.1) and a second wall (2.1.2) which define the peripheral for the air flow through the air inlet (2.1), the first wall (2.1.1) being nearer to the window (3) than the second wall (2.1.2), and both the first wall (2.1.1) and the second wall (2.1.2) having an L-shaped cross section, wherein the first wall (2.1.1) is formed to have a first angle (α) which is 90 degrees, and the second wall (2.1.1) is formed to have a second angle (β) which is less than 90 degrees.

Ansprüche

1. Luftventilator (2), aufweisend

- einen Lufteinlass (2.1),

- einen Luftauslass (2.2),

- einen Luftkanal (2.3) zum Ermöglichen eines Luftstroms zwischen dem Lufteinlass (2.1) und dem Luftauslass (2.2),

- eine Rückschlagklappe (1) zum Verhindern des Strömens von Luft in Rückwärtsrichtung in den Luftkanal (2.3),

- einen ersten Abschnitt (2.7), aufweisend Kanalmittel (2.9) zum Steuern der Richtung des Luftstroms in dem Luftkanal (2.3), wobei der erste Abschnitt (2.7) eine erste Höhe (h1) aufweist; und

- einen zweiten Abschnitt (2.8) aufweisend ein erstes Trageelement (2.10) zum Tragen einer ersten Kante (1) der Rückschlagklappe (1),

dadurch gekennzeichnet, dass der zweite Abschnitt (2.8) des Luftventilators (2) ferner eine zweite Höhe (h2) aufweist, die höher ist als die erste Höhe (h1), und der zweite Abschnitt (2.8) einen Filter (9) zum Filtern von Verunreinigungen aus der durch den Luftkanal (2.3) strömenden Luft aufweist, wobei die Querschnittsfläche des zweiten Abschnitts (2.8) an der Stelle des ersten Trageelements (2.10) kleiner ist als an der Stelle des Filters (9), um die Geschwindigkeit des Luftstroms zu erhöhen, bevor er den Luftventilator (2) über den Luftauslass (2.2) verlässt.

2. Luftventilator (2) nach Anspruch 1, dadurch gekennzeichnet, dass die Rückschlagklappe (1) dazu geeignet ist, durch von dem Lufteinlass (2.1) zu dem Luftauslass (2.2) des Luftventilators (2) strömende Luft gekippt zu werden.

3. Luftventilator (2) nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Höhe der Kanalmittel (2.9) kleiner ist als die Höhe des ersten Abschnitts (2.7), um zu ermöglichen, dass ein kleiner Teil der durch den Luftventilator (2) strömenden Luft über den Kanalmitteln (2.9) durchströmt.

4. Luftventilator (2) nach Anspruch 1, dadurch gekennzeichnet, dass die Länge des ersten Trageelements (2.10) gleich der Breite (w2) des zweiten Abschnitts (2.8) ist.

5. Luftventilator (2) nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass die Rückschlagklappe (1) dazu geeignet ist, zwischen einer ersten Position, in der der Luftkanal des Auslasses (2.2) des Luftventilators (2) geschlossen ist, und einer zweiten Position, in der der Luftkanal des Auslasses (2.2) des Luftventilators (2) offen ist, beweglich zu sein, wobei in der ersten Position eine hintere Kante (1.2) der Rückschlagklappe (1) dazu geeignet ist, auf der unteren Wand (2.8.2) des zweiten Abschnitts (2.8) aufzuliegen.

6. Fenster (3), aufweisend einen Luftventilator (1) nach einem der Ansprüche 1 bis 5.

7. Fenster (3) nach Anspruch 6, dadurch gekennzeichnet, dass das Fenster (3) einen Vorhang (10) mit einem Gehäuse (10.1) aufweist, wobei der Luftventilator (2) oben auf dem Gehäuse (10.1) befestigt ist.

8. Fenster (3) nach einem der Ansprüche 6 oder 7, dadurch gekennzeichnet, dass der Lufteinlass (2.1) eine erste Wand (2.1.1) und eine zweite Wand (2.1.2) aufweist, die den Umfang für den Luftstrom durch den Lufteinlass (2.1) definieren, wobei die erste Wand (2.1.1) näher an dem Fenster (3) ist als die zweite Wand (2.1.2) und sowohl die erste Wand (2.1.1) als auch die zweite Wand (2.1.2) einen L-förmigen Querschnitt aufweisen, wobei die erste Wand (2.1.1) so ausgebildet ist, dass sie einen ersten Winkel (α) von 90 Grad aufweist, und die zweite Wand (2.1.1) so ausgebildet ist, dass sie einen zweiten Winkel (β) von weniger als 90 Grad aufweist.

Revendications

1. Ventilateur (2) comprenant :

- une entrée d'air (2.1),

- une sortie d'air (2.2),

- un passage d'air (2.3) pour permettre un écoulement d'air entre l'entrée d'air (2.1) et la sortie d'air (2.2),

- une trappe de reflux (1) pour éviter que l'air s'écoule dans la direction arrière dans le passage d'air (2.3),

- une première section (2.7) comprenant un moyen de canalisation (2.9) pour commander la direction de l'écoulement d'air dans le passage d'air (2.3), et ladite première section (2.7) ayant une première hauteur (h1) ; et

- une seconde section (2.8) comprenant un premier élément de support (2.10) pour supporter un premier bord (1) de la trappe de reflux (1), caractérisé par le fait que la seconde section (2.8) du ventilateur (2) comporte en outre une seconde hauteur (h2) qui est supérieure à la première hauteur (h1), et la seconde section (2.8) comprend un filtre (9) pour filtrer les impuretés de l'air s'écoulant à travers le passage d'air (2.3) ; dans lequel la zone de la section transversale de la seconde section (2.8) est inférieure à l'endroit du premier élément support (2.10) qu'à l'endroit du filtre (9) pour augmenter la vitesse d'écoulement d'air avant qu'il quitte le ventilateur (2) par la sortie d'air (2.2).

2. Ventilateur (2) selon la revendication 1, caractérisé par le fait que la trappe de reflux (1) est conçue pour pouvoir être inclinée par l'air s'écoulant de l'entrée d'air (2.1) vers la sortie d'air (2.2) du ventilateur (2).

3. Ventilateur (2) selon la revendication 1 ou 2, caractérisé par le fait que la hauteur du moyen de canalisation (2.9) est inférieure à la hauteur de la première section (2.7) pour permettre à une petite portion de l'air circulant à travers le ventilateur (2) de passer au-dessus du moyen de canalisation (2.9).

4. Ventilateur (2) selon la revendication 1, caractérisé par le fait que la longueur du premier élément support (2.10) est égale à la largeur (w2) de la seconde section (2.8).

5. Ventilateur (2) selon l'une quelconque des revendications 1 à 4, caractérisé par le fait que la trappe de reflux (1) est conçue pour être mobile entre une première position, dans laquelle le passage d'air de la sortie (2.2) du ventilateur (2) est fermé, et une seconde position, dans laquelle le passage d'air de la sortie (2.2) du ventilateur (2) est ouvert, dans lequel, dans la première position un bord de fuite (1.2), la trappe de reflux (1) est conçue pour s'appuyer sur la paroi inférieure (2.8.2) de la seconde section (2.8).

6. Fenêtre (3) comprenant un ventilateur (1) selon l'une quelconque des revendications 1 à 5.

7. Fenêtre (3) selon la revendication 6, caractérisée par le fait que la fenêtre (3) comprend un rideau (10) ayant un boîtier (10.1), dans laquelle le ventilateur (2) est fixé sur le dessus du boîtier (10.1).

8. Fenêtre (3) selon l'une quelconque des revendications 6 ou 7, caractérisée par le fait que l'entrée d'air (2.1) comprend une première paroi (2.1.1) et une seconde paroi (2.1.2) qui définit la périphérie de l'écoulement d'air à travers l'entrée d'air (2.1), la première paroi (2.1.1) étant plus proche de la fenêtre (3) que la seconde paroi (2.1.2), et autant la première paroi (2.1.1) que la seconde paroi (2.1.2) ayant une section transversale en forme de L, dans laquelle la première paroi (2.1.1) est formée pour avoir un premier angle (α) de 90 degrés, et la seconde paroi (2.1.1) est formée pour avoir un second angle (β) qui est inférieur à 90 degrés.

Drawing