The invention relates to an air intake ventilator used in housing, public buildings and industrial buildings.

The air intake ventilator known from the Polish patent No. 193909 has the air-inlet pocket equipped with a flow regulator having a form of a movable screen, which has a shape of spread horizontal panel and the axis of rotation of the drum with screw line, and the control string spool unit arranged in the axis of the clamping screw of the housing of the drive. The clamping screw is also an attachment element for the flow regulator. The rotation axis of the flow regulator is coincident with its upper edge.

The intake ventilator known from the Polish patent application No P.399375 has a sleeve of the passage channel fitted with vertical ribs. One side of the sleeve is connected to an air-inlet pocket body consisting of an air-inlet pocket chamber, the walls of which have ribs inside, and of a non-ribbed channel of an air-inlet pocket. The air-inlet pocket chamber is connected to the air inlet-pocket channel, and the shorter walls of the chamber form side closures of the air-inlet pocket chamber. On the inner surfaces of the side closures the racks of toothed catches are located, while on the other side the sleeve is connected to an air-outlet pocket body. The construction of the air-outlet pocket body is the same as the body of the air-inlet pocket. The air-outlet pocket body is composed of an air-outlet pocket chamber connected to a non-ribbed outlet channel of the air-outlet pocket. The walls of the air-outlet pocket chamber have on their inner sides air-outlet pocket ribs. The shorter walls of the air-outlet pocket chamber form side closures of the air-outlet pocket chamber and on the inner surfaces of their side closures there are racks of toothed catches. Inside the inlet pocket chamber there is a grid mesh in the form of straight-diagonal grid frame, which in its lower part transforms into a to mask of the frame of the grid. The longer walls of the grid frame are interconnected by transverse ribs of the frame mesh, and the shorter walls of the frame form side closures of the frame grid and said side closures are equipped with elastic tongues of tooth catches. The longer walls of the grid frame have lateral recesses on their outer sides. In the air outlet pocket chamber a flow regulator in the form of a rectangular bed is arranged. The bed has the same shape as the grid frame. The flow regulator transforms in its lower part into a masking frame .The longer walls of the bed are interconnected by transverse ribs of the bed, and the bed and the mask connected to it have a window, in which a thermostatic throttle is disposed.

The air ventilator known from the British Patent No. GB 2320563 A consists of an elongated housing and a movable flap located in the housing. The flap in its cross- section has a curved shape. The flap has a movable edge, around which air can flow from one side to the other when the flap is in an open position. The movable edge has a projecting lug which is adapted to direct air flow around the movable edge. The flap is connected to the housing by means of fixing located on an edge opposite to the movable edge of the flap and there is a hinged joint between the flap and the housing. The hinged joint of the flap is made of an elastic material and its shape enables deflecting the flap to an open position. The flap has a gap which allows air to flow from one side to the other, and further the flap has an articulation joint between the movable edge and the opposite edge, situated preferably closer to the movable edge. The gap is arranged between the articulation joint and the movable edge. The joint is adapted to seal the ventilator in the fully closed position of the flap, thus allowing adhesion of the flap to the portion of the ventilator or to a part to which the ventilator is mounted. The ventilator has a thermo- sensitive regulator, which allows to run the flap in closed position depending on temperature. In addition, the ventilator has a stopper of flap movement which acts in the open position.

Another air ventilator is known from the European Patent No. EP 0327186 A, wherein the inlet port has a downward channel located in the outer portion of housing, and inside said channel there is a blade with a horizontal hinge axis. The blade has a possibility of movement between the lower, particularly horizontal position, and the upper inclined position, while these items are determined by stops. The wall of the channel co-operates with the blade edge, and said edge is arranged on the opposite side with respect to the hinge axis and is curved in such a way that when the blade is in the lower position, the wall is located at a distance from the edge to maintain the free passage of air. In contrast, when the blade moves to the upper position, the free passage of air is gradually reduced. Furthermore, the blade has an unsealing gap, providing in its upper position with a lower air passage. The unsealing gap is formed by the notches on the free edge of the blade. On the outlet side flap position can be changed and set from the outside. The free movable edge of the flap co-operates with the profiled wall of the housing, and the flap forms a unitary structure with plastic bridge.

The disadvantage of known and described air ventilators lies in that they are mounted directly on the structural profiles of the window by performing slots in these profiles, which allow air flow. Such montage interferes with the construction of windows impairing mechanical parameters of the window, further reducing its thermal and acoustic insulation. A disadvantage of known ventilators mounted above the frame of the window is a rigid structural relationship between the ventilator and a window structure which prevents the compensation of thermal expansion of the window and reduces the range of application either to windows with a low thermal expansion or to the places with low amplitude of outside air temperature. Another disadvantage of the known constructions is the low resistance to freezing the body of the flow regulator and of the flow regulator valve. In addition, it is difficult to direct the inlet air horizontally, which can cause discomfort at low outdoor temperatures. Known solutions have no possibilities of changing the configuration of the ventilator by the user to fit the device parameters to meet the growing needs of the user.

Technical problem to be sol ved is to develop a new design of the ventilator, which should be placed over the construction profile of window without interfering with its operation parameters, and the development of new design and construction of the ventilator characterized by a very easy and precise montage. The ventilator according to the invention enables an elastic mounting as far as the structure of the window is concerned, and it can be applied to all types of windows and in all climatic zones. The air ventilator according to the invention is characterized by high resistance to frost and furthermore, it is characterized by horizontal direction of the air flow. Moreover, it has as the abil ity to change the configuration in order to adapt to the growing needs of the user. The ventilator of the invention is characterized by remarkable technical and functional usabi lity, allowing to ensure proper ventilation, and at the same time to reduce the consumption of thermal energy required for heating ventilation air during the heating season, thanks to the automatic adjustment of the size of the supply air stream.

The nature of the air-intake ventilator according to the invention is characterized in that an air-intake box, which is located on one side of a flow channel, has a stub-pipe and a partition with an opening, and the partition has a flange and side closures provided with guides and guide channels and it has outer walls of the guides. On the other side of the channel there is an air-outlet box which also has a stub-pipe and a partition with an opening. The partition is provided with a flange and it has a side closures provided with guides and guide channels, and it also has outer walls of said guides. Inside the guide channels there are strips. The outer walls have vertical ribs of a coupling mechanism, and between the ribs there are fixing plates provided with cotter pins. Inside the air-intake box an air-intake pocket is situated. The pocket has a form of a frame which transformers its shape into a mask and a grid. The mask has a leap, to which a filter housing is adjacent. Inside the air-outlet box there is a flow regulator provided with a cover, a frame and a mask. The cover has a horizontal wall provided with a recess, a vertical wall and closing walls. The cover has also two peripheral ribs and a middle rib and it comprises two upper boxes. In the spaces between the peripheral ribs and the middle rib there are fittings of thermal and acoustic insulation. The frame includes an inlet stringer and an outlet stringer which are connected to each other with peripheral ribs and a middle rib. Said frame includes also two lower boxes. The mask is provided with a front plate, on the upper surface of which there are the two peripheral ribs and one middle rib. In the space between the peripheral ribs and the middle rib there are fittings for acoustic insulation. The inner surfaces of the fittings form a channel of the flew regulator, in which a throttle is located. The ventilator according to the invention has a thermal drive assembly. The flow channel, the air-intake box, the air-outlet box and an elastic pad enclose a window frame on its outer side, forming a kind of overlay situated on the window frame. The lower edge of the air-intake box is included in a top surface of an outer window cavity, while the bottom edge of the air-outlet box is included in a top surface of an inner window cavity. The flow channel, which in cross section has a rectangular shape, is provided with insulating pads having the form of cuboids which are adjacent to the outer walls of the flow channel. Between the lower surfaces of the stub-pipes, the lower surface of the flow channel and the upper surface of the frame of the window the elastic pad is located. The ribs have openings and fixing plates have recesses in which cotter pins are located. The inner walls of the guides are provided with slots. The strips have catches and stoppers. The stoppers arranged in the slots enclose the flow channel. The rectangular frame has at least two sockets designed for support brackets of acoustic silencers. In an alternative solution, the frame of the air-intake pocket has in its lower part a mask with a protective shield of the air-intake pocket and said protective shield is provided with an inlet opening of the air- intake pocket, and said air-intake pocket has a perforated insert. The housing of the filter has a side surface and a front shield with inlet openings, and it has at least one transverse rib. Inside the housing a filter cloth is spanned. The distance between the inlet opening of the protective shield and the inlet opening of the front shield of the dust filter equals "a", where "a" is the width of the dust filter opening. The flange located in the air-outlet box is adjacent to the recess in the cover of the flow regulator and simultaneously adheres to the edge of the inlet stringer of the frame . The vertical wall of the cover of the flow regulator and the closing walls of the cover of the flow regulator have openings for elastic clicks. The inlet stringer and the outlet stringer of the frame of the flow regulator have preferably cross-sectional shape of the letter "L", and they have catches for resilient clicks. The peripheral ribs are provided with socks , while a middle rib has a nest. The peripheral ribs are provided with sockets and have a socket, and a middle rib has a nest and a catch. The vertical wall of the cover is adjacent to the outlet stringer of the frame, while the closing wall of the cover adheres to the inlet stringer. The catches of the elastic clicks are placed in the openings of the elastic clicks, the upper box adjoins the bottom of the lower box forming a closed chamber of the thermal drive, whereas a second upper box is adjacent to the second lower box forming a closed chamber of the manual drive, furthermore the sockets and the openings for shafts, while the sockets are the openings for a tube. The throttle is positioned in the nest. The peripheral ribs have hooks of the elastic clicks catches and the middle rib has a claw. The frame and the mask are mutually arranged in such a manner, that the lower edge of the peripheral rib abuts the upper surface of the front plate. The hooks of the elastic clicks are located in the sockets, while the catch of the middle rib is adjacent to the claw of the middle rib. The chamber of the thermal drive chamber has sockets in which a yoke of the thermal drive assembly is mounted. The manual drive chamber is provided with sockets in which an axle of a manual lever is mounted, and said axle is provided with a cam. The sockets are in the form of rectangular projecting frames. The shape of the socket is similar to a cylinder surface and the socket has the shape of a hole. Inside the thermal drive chamber an electric motor is situated. The thermal drive assembly has the yoke provided with a sleeve and a recess, and it has a yoke shaft, and a socket. Inside the sleeve the tube and a push bar are mounted, and inside the tube a rod and a pin with a screw are situated. The yoke shaft has a first lever with a socket for a magnet and a second lever. The yoke has the form of a closed frame which shape is similar to a rectangle. The sleeve is positioned on the wall which is opposite to the recess of the yoke. In said recess the yoke shaft is situated. The lever with a socket for a magnet is provided with a first magnet, while in the second socket a second magnet is located, and the magnetic fields of the magnets attract each other preferably. The throttle is constructed in a shape of a spread panel, and in its cross-section there is at least one empty chamber. The throttle has shafts at its ends, and the rotation axes of said shafts coincide with an axle of the throttle. The first shaft has a first lever and the second shaft has a second lever. The second lever of the yoke shaft is coupled to the first lever of the first shaft of the throttle and in the same time the lever on the yoke shaft is a bumper limiting the opening angle of the throttle . The cam is coupled to the second lever of the second shaft of the throttle and in the same time the cam is a bumper limiting the opening angle of the throttle. The throttle is mounted rotary on the axes and on bearing shells, and one of the bearing shells is mounted in a bracket and a second bearing shell is disposed in the socket of the yoke. The throttle is preferably located near the inlet to the passage. The surface of the throttle is adjacent to a return spring. There is a relationship of L / H > 2.5, where L is the distance between the lower edge of the closed throttle and the upper edge of the outlet opening of the passage , and H is the height of the passage. The angle a between horizontal plane and the longitudinal axis of the passage is less than or equal to 35 °. The lower wall of the passage near to its outlet opening has a horizontal surface of length A, for which there is the relationship A/H > 0.5 , where H is the height of the channel.

The invention enables an easy and simple installation of the ventilator just above the window, and does not interfere with the construction of the window and thus does not require slits in the window and door frames, does not reduce the technical performance of the window. Moreover, the ventilator of the invention has particular rigidity and ease assembly, thanks to the stiffening strips which stabilize the position of the channel in relation to connected ventilator elements. In addition, the solution according to the invention, thanks to the coupling mechanism situated between the ventilator and the window, enables easy and precise assembly of the ventilator and extends its application to all types of windows and all climatic zones. In the first phase, the whole construction of the ventilation is screwed precisely and rigidly to the window frame. Next, the window with the ventilator encased in it is mounted in an opening of the wall. Finally, the coupling mechanism i s disengaged, which enables reciprocal movement of the window in relation to the stationary ventilator, which unexpectedly results in compensation of thermal expansion of the window frame. A further advantage of the solution of the present invention enables to accurate machining of plaster of mounted window, because the surfaces of the lower edges of air-intake box and air-outlet box are the markers defining the position of the plaster. Another advantage of the solution according to the invention is that the ventilator of the invention has particular resistance against freezing of the body of the flow regulator because of using thermal insulation directly inside the flow channel of the flow regulator, thermal insulation in chambers of flow channel, using closed air chambers at both ends of the flow regulator, applying in the opening of the air-intake box a flange adjacent to the opening in the wall of the flow regulator, and using additional sealing elements. Moreover the ventilator according to the invention is characterized by a special frost resistance as far as the throttle of the flow regulator is concerned because of the appropriate relationship between the height H of the flow channel and the distance L between an edge of the closed throttle and an edge of the inlet opening of the flow channel. The noise reduction is a result of using two silencers in the air-intake pocket, sound damping inserts in the flow channel, the flexible sound damping pad located below the flow channel and the sound absorber in flow regulator. Next advantage of the solution according to the invention is that it guarantees a preferably horizontal flow of the supplied air, because of a suitable angle a between the horizon plane and the longitudinal axis of the channel the flow regulator and the appropriate shaping of the outlet opening of the channel.

An example of realization of the present invention is presented on accompanying drawings.

Fig. 1 shows a perspective view of the air intake ventilator from the bottom without the dust filter housing, ^' .

Fig. 2 shows the complete intake ventilator in a perspective view from below,

Fig. 3 shows the intake ventilator applied to the window frame in cross section along line

A-A in Fig. 2., .

Fig. 4 shows a perspective view of the intake ventilator in the cross-sectional top view along line A-A in Fig. 2,

Fig. 5 shows a distributed axonometric view of the intake ventilator viewed from the bottom

Fig. 6 shows a distributed axonometric view of the intake ventilator from the bottom with partially mounted air-intake pocket and partially mounted flow regulator,

Fig. 7 shows the air-intake box, removed air-intake pocket and the removed dust filter housing in a distributed axonometric view from below, Fig. 8 shows the air-outlet box and removed flow regulator with removed flow regulator screen mask in a distributed axonometric view from below,

Fig. 9 shows the air-intake pocket in a distributed axonometric viewed from the top,

Fig. 10 shows the flow regulator in a distributed axonometric view from below,

Fig. 11 shows the frame of the flow regulator in axonometric view from above,

Fig. 12 shows the cover of the flow regulator in axonometric view from below,

Fig. 13 shows the thermal actuator assembly with the throttle in an axonometric view,

Fig. 14 shows the thermal actuator assembly with the throttle in a distributed axonometric view,

Fig, 15 shows a detail of the intake ventilator in section along the line B-B in Fig. 3 in axonometric view from above,

Fig. 16 shows an alternative design of the air-intake pocket of the intake ventilator in a distributed axonometric view from the top,

Fig. 17 shows an alternative design of the air-intake pocket of the intake ventilator in cross-section along line C-C of Fig.16, and

Fig. 18 shows the air-intake box and the air- outlet box with a window frame mounted on a wall in an axonometric view from below.

Intake ventilator according to the invention has a flow channel 1 having a cross section similar to a rectangle, provided with an insulating pad 2 having a form of a cuboid and adjacent to the outer walls of the flow channel 1. One side of the flow channel 1 is connected to the bottom of a downwardly opened air- intake box 3 provided with a stub- pipe 4, separated from the air-intake box 3 with a partition 5 having an opening 6 which has a shaped flange 7. The upper wall of the air-intake box 3 has a protrusion 8 on a part of its perimeter. Shorter walls of the air-intake bo 3 form side closures 9 of the air-intake box. On the outer surface of the side closures 9 there are guides 10 for stiffening - positioning sliding strips 11. On the inner surfaces of the closures 9 of the air-intake box 3 there are socks 12 for clamping screws. The guides 10 have: guide channels 13, the outer walls 14 and inner walls 15. The inner walls 15 of the guides have slots 16. The outer walls 14 of the guides have vertical ribs 17 of the coupling mechanism and said ribs have openings 18. Between the ribs 17 there are fixing plates 19 having recesses 20 and a sockets 21 for the screws 22 which secures the fixing plates 19 to a window frame 23. The fixing plates 19 are fixed to the ribs 17 with the cotter pins 24 which pass through the openings 18 and the recesses 20. On the other side the flow channel 1 is connected to a downwardly opened air-outlet box 25 constructed similarly to the air-intake box 3 and also provided with the stub-pipe 4 separated from the box 25 with the partition 5 having the opening 6 which has the shaped flange 7. The upper wall of the air-outlet box 25 has the protrusion 8 on a part of its perimeter . Shorter walls of the air-outlet box 25 form side closures 26 of the air-outlet box 25. Gn the outer surface of the side closures 26 there are guides 10 for the sliding strips 11, and on the inner surfaces of the side closures 26 inside the air-outlet box 25 there are sockets 12 for clamping screws. The guides 10 have: guide channels 13, outer walls 14 and inner walls 15 The inner walls 15 of the guides have slots 16 The outer walls 14 of the guides have vertical ribs 17 of the coupling mechanism with openings 18. Between the ribs 17 there are fixing plates 19 having the recesses 20 and the sockets 21 for the screws 22 which secures the fixing plates 19 to the window frame 23. The fixing plates 19 are fixed to the ribs 17 with the cotter pins 24 which pass through the openings 18 and recesses 20. Between the lower surfaces of the stub-pipes 4, the bottom surface of the flow channel 1 and the upper surface of the window frame 23 there is an elastic pad 27. Inside the guide channels 13 of the guides 10 there are sliding strips 11 and said strips have on one side catches 28 and on the other side stoppers 29. The stoppers 29 are located in slots 16 and enclose the channel 1. Opened ends of the flow channel 1 are located inside the stub-pipes 4. Inside the air-intake box 3 there is an air-intake pocket 30, having the form of rectangular frame 31 which transforms at the bottom into a mask 32 with a grid 33. In an alternative version the frame 31 transforms at the bottom part into the mask 32 with a protective shield 34 provided with an inlet opening 35 and it has a perforated insert 36. Longer walls of the frame 31 have sockets 37 for support brackets 38 and 39 for acoustic silencers 40 and 41. Shorter walls of the frame 31 have notches for the sockets 12 for the screws that secure the air-intake pocket 30 to the air-intake box 3. The mask 32 protrudes over the perimeter of the frame 31 forming around the frame 31 a mask flange 42. The lower surface of the mask 32 on its periphery is formed with a leap 43. An upper edge of the dust filter housing 44 is adjacent to the leap 43. The housing 44 has a side surface 45 and a front shield 46 of the inlet openings 47. The front shield 46 has a width "a", and the inlet opening 35 is preferably offset in relation to the inlet opening 47 by a distance "a". The longer side walls 45 and a front shield 46 are connected by a transverse rib 48. Inside the housing 44 a filter cloth 49 is spread. Inside the air-outlet box 25 there is a flow regulator 50 having a cover 51, a frame 52, and a mask 53. The cover 51 of the flow regulator 50 has the shape of an angular spread profile with a horizontal wall 54 and a vertical wall 55. The horizontal wall 54 has a recess 56 and an elastic cap 57. The vertical wall 55 has a stiffening rib 58 and openings 59 of elastic clips. The cover 51 of the flow regulator 50 terminates in lateral seals 60 with the cavity 61 which houses the sockets 12. The cover 51 has two peripheral ribs 62 bases of which are adjacent to the walls 54 and 55 and said ribs are provided with sockets 63 and 64 and the middle rib 65 adjacent to the walls 54 and 55 and provided with the nest 66. The lateral seals 60, the rib 62, parts of the walls 54 and 55 and peripheral closing walls 67 form an upper box 68 of a thermal drive chamber 69. The lateral seals 60, the rib 62, parts of walls 54 and 55 and closing wall 67 form an upper box 70 of a manual drive chamber 71. In the vault of the box 68 formed by the part of the wall 54 there is a socket 72 having a form of a projecting frame 73. In the vault of the box 70 formed by a part of the wall 54 are located: a socket 74 hawing a form of a protruding rectangular frame 75 and a cylindrical socket 76 having the form of a protruding portion of the cylinder 77. In the spaces between the ribs 62 and the middle rib 65 there are profiled fittings 78 for thermal and acoustic insulation. The closing wall 67 has openings 59 for elastic clicks. The frame 52 of the flow controller 50 consists of an inlet stringer 79 and an outlet stringer 80 connected with peripheral ribs 81 and a middle rib 82. The peripheral ribs 81 on their upper edges have sockets 83 and 84, and on their lower edges have projections 85. The outer side surfaces of the lower portions of the ribs 81 are provided with sockets 86 and guiding grooves 87 connected with the sockets 86. The upper edge of the middle rib 82 has a nest 88, while the lower edge is provided with projections 85 and a catch 88'. The stringers 79 and 80 in cross section have a shape similar to the letter "L". The vertical walls of the stringers 7 and 80 are equipped with catches 89 of the elastic clicks. The vertical wall of the stringer 79 has a socket 90 for the return spring 91. The vertical walls of the stringers 79 and 80 are connected to side closures 92 of the frame 52 of the flow regulator 50. The lengthening of the horizontal walls of the stringers 79 and 80 forms a surface of a baffle 93 of the frame 52. One of the side closures 92, the vertical walls of the stringers 79 and 80, as well as one peripheral rib 81 and the surface of the baffle 93 form a lower box 94 of the thermal drive chamber 69. The second side closure 92 and the vertical walls of the stringers 79 and 80 and the second peripheral rib 81 and also the surface of the baffle 93 form a lower box 95 of the manual drive chamber 71. The lower box 94 on the upper surface of the baffle 93 has a socket 96 in the form of a projecting frame 97, while the lower box 95 on the upper surface of the baffle 93 has a socket 98 and a circular socket 99. The vertical wall 55 of the cover 51 of flow regulator 50 is adjacent to the outlet stringer 80 of the frame 52 of the flow regulator 50. The closing wall 67 of the cover 51 of the flow regulator 50 is adjacent to the inlet stringer 79. The catches 89 of the elastic click are located in the openings 59 of the elastic click. The upper bo 68 is adjacent to the lower box 94 forming the closed manual drive chamber 71. Inside the chamber 69 in the sockets 72 and 96 a yoke 100 of a thermal drive assembly 101 is located. Inside the chamber 71 and in the sockets 74 and 98 there is a bracket 102 of a bearing shell 103 of an axle 104 of a throttle 105, and in the sockets 76 and 99 there is a cylindrical axle 106 of a manual lever 107. The edges of the peripheral ribs 62 of the cover 51 of the flow regulator 50 are adjacent to the upper edges of the peripheral ribs 81 of the frame 52 of the flow regulator 50 and the sockets 63 and 83 form openings for shafts 108 of the throttle 105 and the socket 64 and 84 form culvert for a tube 109 of the thermal drive assembly 101. The edge of the middle rib 65 of the cover 51 of the flow regulator 50 is adjacent to the edge of the middle rib 82 of the frame 52 of the flow regulator 50 and the nests 66 and 88 define an opening for the throttle 105. The mask 53 of the flow regulator 50 has of a front plate 110 having a cross section in the shape of an arc. The plate 110 has on its lower surface a lateral groove 111 for a bar 112 , and on its upper surface has a frame 113 projecting around its perimeter. On the upper surface of the plate there are two peripheral ribs 114 and one middle rib 115. The peripheral ribs 114 have hooks 116, and the middle rib 115 has a claw 117 of the click. In the space between the peripheral ribs 114 and the middle rib 115 fittings 118 are located for thermal and acoustic insulation. The frame 52 of the flow regulator 50 and the mask 53 of the flow regulator 50 are mutually arranged in such a way, that the lower edge of the ribs 81 abuts against the upper surface of the front plate 110. The hooks 116 are located in the sockets 86, and the catch 88' of the middle rib 82 is adjacent to the claw 117 of the middle rib 115. The inner surfaces of the fittings 78 and fittings 118 form a passage 119 of the flow regulator 50, and said passage is "H" in height. Inside the passage 119 the throttle 105 is disposed. The lower edge of the closed throttle 105 is spaced from the upper edge of the outlet opening of a distance " L", for which a relationship: L / H> 2.5 takes place. In addition, the longitudinal axis of the passage 119 is inclined in relation to the horizontal plane of an angle a less than or equal to 35 °. The bottom wall of the passage 119 located near the outlet opening of the passage 119 has a horizontal surface with a length for which there is a relationship: A / H> 0.5, where "H" is the height of the passage 119. The throttle 105 is mounted rotary on the axles 104 and the bearing shells 103. First bearing shell 103 is mounted in the bracket 102 of the axle of the throttle 105, and the second bearing shell 103 is located in a socket 120 of the yoke 100 of the thermal drive. The first shaft 108 of the throttle 105 has a first lever 121 co-operating with the thermal assembly 101. The second shaft 108 of the throttle 105 has a second lever 122 co-operating with a cam 123 of the manual lever 107. The thermal drive assembly 101 has the metal tube 109 which is a shell for a polymeric rod 124. Said tube is at one end closed with a pin 125 having a threaded hole 126 and an adjusting screw 127, and the other end of the tube is connected to the sleeve 128 of the yoke 100. The yoke 100 has the form of a closed frame with a rectangular shape. One of the front faces of the yoke 100 has a sleeve 128 and a recess 129. On a side surface of the sleeve 128 a socket 130 is located which is designed for a magnet 131. The front wall of the yoke 100, opposite to the side surface of said sleeve, has a recess 132 and socket 133 for an axle 134 of a yoke shaft 135. The yoke shaft 135 has a hole 136 for the axle 134, the first lever with a socket 137 for the magnet 131 and a second lever 138. In the sleeve 128 there is a pushing rod 139. On the side wall of the yoke 100, from the inside, a socked 140 is located, which is designed for the bearing shell 103 of the throttle 105. An increase in temperature of the inlet air causes increase in length of the rod 124, which leads to a movement of the pushing rod 139. This movement is transmitted to the lever 137 against attracting forces of magnets 131 and further by the yoke shaft 135 is transmitted to the lever 138, which in turn moves the lever 121, causing the rotation and opening of the throttle 105 with force of the return spring 91. In the alternative solution of the invention the thermal drive assembly is replaced with an electric motor 141. The flow channel 1 and the air-intake box 3 connected to the channel, and the air-outlet box 25 enclose the window frame 23 from the outer side, forming a kind of overlay, which is placed in the gap between the wall of the building and the window frame. During the assembling of the ventilator, the air-intake box 3 and the air-outlet box 25 are sealed with foamed polystyrene inserts and thus a window cavity can be easily and accurately machined. A lower edge 142 of the air-intake box 3 is included within an upper surface of outer cavity of the window 143, and a lower edge 144 of the air-outlet box 25 is included within a upper surface 145 of the internal cavity of the window, and the edges 142 and 144 serve as markers for the treatment of a window.