JP7198501B2 - ventilator - Google Patents

Description

TECHNICAL FIELD The present invention relates to a ventilation system that uses a fan to take in outdoor air indoors.

2. Description of the Related Art Ventilation systems are known that maintain a clean indoor environment by blowing fresh outdoor air indoors using a fan. In such a ventilator, especially when the room is heated in cold weather, the cold outdoor air is discharged indoors, causing condensation and the cold air hitting the feet of the occupants, giving them discomfort.

Therefore, in the ventilators disclosed in Patent Documents 1 and 2, the device main body has an indoor side inlet for introducing indoor air in addition to the outdoor side inlet for introducing outdoor air. Outdoor air and indoor air are mixed in the space inside the ventilator, and the mixed air is sucked into the intake port of the fan and blown indoors from the outlet of the main body of the device.
According to the above ventilation system, cold outdoor air is mixed with warm indoor air and supplied indoors in cold weather, so the cold air can be softened, preventing condensation and the cold air from hitting the feet of the residents. can be suppressed.

JP-A-2000-274784 JP-A-2005-133961

In the ventilators disclosed in Patent Documents 1 and 2, there is a space for mixing outdoor air and indoor air in the main body of the device. be greatly affected. For example, when the outdoor wind pressure is high, the outdoor air presses the indoor air, and as a result, the ratio of the outdoor air increases abnormally, preventing the above-mentioned condensation and cold air on the feet of the residents. I can't do it.

The present invention has been made to solve the above problems, and includes an outdoor side introduction port for introducing outdoor air, an indoor side introduction port for introducing indoor air, and a combination of outdoor air and indoor air. a hollow device body having a blowout port for blowing out mixed air; and a hollow device body installed in the device body for sucking the outdoor air and the indoor air from the suction port to produce mixed air of the outdoor air and the indoor air. and a fan that discharges to the outlet,
an outdoor air passage further comprising a partition wall disposed in the apparatus main body and extending to the suction port of the fan, wherein the partition wall guides outdoor air from the outdoor side introduction port to the suction port; An indoor air passage for guiding indoor air from the indoor-side inlet to the suction port is isolated.

According to the above configuration, the partition wall prevents the outdoor air and the indoor air from mixing all the way to the fan suction port. It can be mixed with air and blown indoors. Therefore, even if the outdoor wind pressure is high in cold weather, the temperature of the mixed air can be reliably raised above the temperature of the outdoor air. can.

Preferably, the apparatus main body is formed elongated, the rotation axis of the fan extends along the longitudinal direction of the apparatus main body, and the partition wall extends in the longitudinal direction of the apparatus main body and has one end extending from the fan. The outdoor air passage and the indoor air passage have a first partition wall portion that reaches the suction port and a second partition wall portion that at least partially extends in a direction intersecting with the longitudinal direction of the apparatus main body. Each has a fan-side passage portion isolated by the first partition wall portion.
According to the above configuration, the outdoor air and the indoor air flow along the rotation axis of the fan while being isolated from each other and are sucked into the fan, so that the indoor air can be sucked in more reliably together with the outdoor air.

Preferably, a filter insertion port for detachably inserting a filter is formed between the other end of the first partition wall portion and the second partition wall, and the filter is provided for the outdoor air. An outdoor-side filter portion arranged at an open end opposite to the suction port in the fan-side passage portion of the passage, and an open end opposite to the suction port in the fan-side passage portion of the indoor-side air passage. and a boundary portion between the outdoor side filter portion and the indoor side filter portion is arranged in the filter insertion port.
According to the above configuration, dust such as pollen contained in outdoor air and indoor air is removed by the outdoor side filter portion and the indoor side filter portion of the filter, so that clean mixed air can be blown indoors. . In addition, since the filter can be detachably attached through the filter insertion opening between the first partition wall and the second partition wall, replacement work is easy.

Preferably, the device main body has a retention chamber connected to the outdoor side introduction port, and the second partition wall slopes toward the outside so as to approach the fan, thereby dividing the internal space of the device main body. and separates the fan-side passage portion of the indoor air passage from the retention chamber, and the second partition wall communicates the fan-side passage portion of the outdoor air passage with the retention chamber. A communication port is formed so that the outdoor side air passage includes the fan side passage portion and the retention chamber, and the outdoor side filter portion and the indoor side filter portion are arranged on two planes that intersect each other. The filter has a bent shape, the outdoor side filter section is arranged along the second partition wall section, and the indoor side filter section is arranged in a direction intersecting the second partition wall section. and the indoor side introduction port is arranged between the second partition wall portion and the indoor side filter portion.
According to the above configuration, the retention chamber works as a buffer, so that the influence of a temporary increase in outdoor wind pressure can be mitigated. Also, the filter can be inserted along the second partition wall, which facilitates the installation work. Furthermore, a space is formed between the indoor-side filter portion and the second partition wall portion, and the indoor-side introduction port can be connected to this space.

Preferably, the fan is installed in the central portion of the apparatus main body, has the suction port at both ends thereof, and has the outdoor side inlet, the indoor side inlet, the outdoor air passage, and the indoor air passage. and the partition walls are arranged on both sides of the fan.
According to the above configuration, the outdoor air and the outdoor air can be sucked in from both sides of the fan.

Preferably, the device main body includes a front wall facing indoors, a rear wall facing outdoors, and a bottom wall, wherein the rear wall is formed with the outdoor side inlet, and the bottom wall is formed with the indoor side. An inlet is formed, and the outlet is formed in the front wall.
According to the above configuration, since the direction of introduction of the indoor air and the direction of blowing out the mixed air are different, it is possible to prevent the blown mixed air from being immediately introduced into the ventilation device, thereby ensuring good ventilation and ensuring that the air is not blown out in cold weather. It can effectively soften the cold air.

Preferably, the device main body includes a front wall facing indoors and a rear wall facing outdoors, the rear wall being formed with the outdoor side introduction port, and the front wall being provided with the fan and the filter. An opening for exposing is formed, and this opening is adapted to be opened and closed by a cover rotatably supported by the apparatus main body. The cover is provided as a part of the front wall, and the A switch is arranged on the main body of the apparatus to respond to opening and closing operations of the cover. The switch rotates the fan when the cover is in the closed position, and the cover is closed. Stop the fan when in the open position.
According to the above configuration, when the cover is opened for fan maintenance or filter replacement, the fan can be automatically stopped. When closed, the fan can be automatically driven to rotate.

Preferably, a shutter plate arranged along the back wall of the apparatus body is further moved between an open position for opening the outdoor inlet and a closed position for closing the outdoor inlet. an actuator, wherein the switch drives the actuator to open the shutter when the cover is closed, and drives the actuator to close the shutter when the cover is opened. .
According to the above configuration, when the cover is opened for maintenance of the fan, replacement of the filter, etc., the outdoor inlet is automatically closed in conjunction with the stop of the motor, and when the cover is closed, the motor rotates. The outdoor side introduction port can be automatically opened in conjunction with the start.

According to the present invention, indoor air can be reliably sucked in by a fan without being greatly affected by outdoor wind pressure, mixed with outdoor air, and blown indoors.

It is the front view which looked at the sash door which incorporated the ventilation device which concerns on one Embodiment of this invention from the indoor side. It is the perspective view which looked at the said ventilator from the indoor side. It is the perspective view which looked at the said ventilator from the outdoor side. It is a perspective view which shows the said ventilator in the state which opened the cover. Fig. 3 is a perspective view showing the ventilating device in a disassembled state into a device main body, a fan, and a filter; It is sectional drawing which cut|disconnected the right half of the said ventilator in the horizontal plane. It is sectional drawing which cut|disconnected the left half of the said ventilator in the horizontal plane. It is a top view of the said filter. It is the figure which looked at the said filter from the arrow B direction in FIG. 6A. It is the figure which looked at the said filter from the arrow C direction in FIG. 6A.

An embodiment of the present invention will be described below with reference to the drawings. As shown in FIG. 1, a window frame 1 fitted in a hole in a wall of a building supports a sash door 2 so as to be rotatable around its right edge, for example, so that it can open to the outside. .
The ventilation device 3 of the present invention is incorporated in the sash door 2 as an upper frame of the sash door 2 or a part of the upper frame.

As shown in FIGS. 1 to 3, the ventilator 3 includes a hollow device body 10 elongated in the left-right direction and closed at both ends. A fan 20 is arranged in the central part of the apparatus main body 10, and a ventilation guide 30 and a filter 40 are arranged on the left and right sides thereof.

The apparatus main body 10 has a vertically upright front wall 11 facing the interior. The front wall 11 is formed with an elongated opening 11a extending in the left and right direction. Through the opening 11a, the fan 20, the left and right ventilation guides 30, and the filter 40 are exposed indoors.
At the lower edge of the opening 11a, the lower edge of a laterally extending cover 15 is rotatably supported by a hinge 16 on the air blow guide 30 and further on the apparatus main body 10. The cover 15 opens and closes the opening 11a. ing. A cover 15 is provided as part of the front wall 11 and has a blowout port 15a consisting of a large number of holes for blowing out mixed air, which will be described later.

As shown in FIGS. 3 and 4, magnets 17 are fixed to the left and right portions of the surface of the cover 15 facing the outdoor side, and magnets 18 are also fixed to the surfaces of the left and right air blow guides 30 facing the indoor side. The closed state of the cover 15 is maintained by the magnets 17 and 18 attracting each other.

As shown in FIGS. 2B, 5A, and 5B, the device body 10 has a vertically upright rear wall 12 facing the outdoors. On the left and right sides of the rear wall 12, outdoor side inlets 12a for introducing outdoor air are formed. The outdoor side introduction port 12a of the present embodiment is configured by arranging a plurality of vertically aligned hole groups at equal pitches in the left-right direction.

A shutter plate 50 is arranged in the apparatus main body 10 so as to be in contact with the indoor side surface of the rear wall 12 . The shutter plate 50 extends in the left-right direction, and a large number of control openings 51 corresponding to the outdoor side inlets 12a are formed at the left and right portions at the same pitch as the outdoor side inlets 12a. The shutter plate 50 is moved by the actuator 55 to the open position where the control port 51 coincides with the outdoor side introduction port 12a to open the outdoor side introduction port 12a, It is adapted to be moved left and right between the closed position where 12a is closed.

As shown in FIGS. 3 to 5, indoor side introduction ports 13a for introducing indoor air are formed in the left and right portions of the bottom wall 13 of the apparatus main body 10. As shown in FIGS.

As shown in FIGS. 3 to 5, the fan 20 arranged in the central part of the apparatus main body 10 is composed of a double sirocco fan. and blades 23 fixed to the left and right output shafts of the motor 22 and arranged in a cylindrical shape. The axis of rotation of the blade 23 extends in the longitudinal direction of the apparatus main body 10, and the tip opening thereof serves as a suction port 24. As shown in FIG. An indoor-side open portion of the case 21 is provided as a discharge port 25 . The air discharged from the discharge port 25 is blown indoors from the discharge port 15 a of the front wall 11 .

As shown in FIGS. 5A and 5B , each of the pair of air blow guides 30 includes a cylindrical guide body 31 with both left and right ends opened, and first and second partition walls 35 in the shape of a flat plate standing vertically. , 36 (partition wall).
The first partition wall portion 35 extends in the longitudinal direction of the device main body 10 and divides the internal space of the guide main body 31 into two fan-side passage portions 37a and 38a. One end of the guide body 31 and the first partition wall portion 35 extends to the suction port 24 of the fan 20 . The first partition wall portion 35 is configured such that the area A of the suction port 24 of the fan 30 is set so that the fan side passage portion 37a on the outdoor side is large and the fan side passage portion 38a on the indoor side is small, for example, at a ratio of 7:3. is divided so that

The second partition wall 36 has an outdoor end connected to the other end of the guide body 31 and crosses the internal space of the device body 10 . The second partition wall portion 36 is inclined with respect to the longitudinal direction of the device main body 10 so as to approach the fan 20 from indoors to outdoors.

Between the second partition wall portion 36 and the closed end of the apparatus main body 10, a retention chamber 37b is formed which communicates with the outdoor inlet 12a of the rear wall 12. As shown in FIG.
A communicating port 36 a is formed in the outdoor side portion of the second partition wall portion 36 . The retention chamber 37b and the outdoor fin side passage portion 37a are communicated through the communication port 36a. The retention chamber 37b and the fan side passage portion 37a constitute an outdoor air passage 37 for guiding the outdoor air introduced from the outdoor side introduction port 12a to the suction port 24 of the fan 20. As shown in FIG.

The indoor-side portion of the second partition wall portion 36 separates the retention chamber 37b from the indoor-side inlet 13a and the indoor-side fan-side passage portion 38a. An indoor air passage for guiding the indoor air introduced from the indoor side inlet 13a to the suction port 24 of the fan 20 by the space 38b directly above the indoor side inlet 13a and the fan side passage portion 38a in the device main body 10. 38 are configured. Space 38b is much smaller than residence chamber 37b.

The first partition wall portion 35 extends toward the second partition wall portion 36 , and a gap is formed between the other end and the second partition wall portion 36 . This gap is provided as a filter insertion opening 39 .

As shown in FIG. 6, each of the pair of left and right filters 40 has a frame 41 and two filter materials 42 and 43 . The frame 41 has a first frame portion 41a on the outdoor side and a second frame portion 41b on the indoor side. The first frame portion 41a and the filter material 42 attached to the first frame portion 41a constitute an outdoor filter portion 47, and the second frame portion 41b and the filter material 43 attached to the second frame portion 41b constitute an outdoor filter portion 47. , an indoor filter unit 48 is configured. The outdoor side filter portion 47 has a larger area than the indoor side filter portion 48 .

The outdoor side filter portion 47 and the indoor side filter portion 48 are arranged on a plane that intersects with each other at approximately 90°, whereby the filter 40 has a bent dogleg shape. The filter 40 further has a knob 45 integral with the indoor edge of the frame 41 .

The outdoor side filter portion 47 is arranged along the second partition wall portion 36, at the opening end of the fan side passage portion 37a on the side opposite to the fan 20 (that is, between the retention chamber 37b of the outdoor air passage 37 and the fan side passage portion 37a). between).
The indoor side filter portion 48 is inclined in the opposite direction to the second partition wall portion 36 and intersects the second partition wall portion 36, and the opening end of the fan side passage portion 38a on the side opposite to the fan 20 (that is, between the space 38b and the fan-side passage portion 38a). In other words, the space 38b and the indoor inlet 13a are arranged between the indoor filter 48 and the second partition wall portion 36 .

As shown in FIGS. 5A and 5B , the filter 40 has the cover 15 opened, the knob 45 is gripped by hand, and the outdoor side filter portion 47 is inserted into the filter insertion opening 39 . It can be easily installed by pushing it towards the In this installed state, a boundary portion 49 (bent portion) between the outdoor filter portion 47 and the indoor filter portion 48 of the filter 40 closes the filter insertion opening 39 . The knob 45 is arranged along the cover 15 in the closed state.

As shown in FIG. 3 , a switch 70 that operates in response to the opening and closing of the cover 15 is installed on the device body 10 , more specifically, on the indoor side of the case 21 of the fan 20 .
When the cover 15 is opened during maintenance of the fan 20 or replacement of the filter 40, the switch 70 is turned off, stopping the motor 22 of the fan 20 and driving the actuator 55 to close the shutter plate 50 (outdoor side). position to close the introduction port 12a).
When the maintenance of the fan 20 and the replacement of the filter 40 are completed and the cover 15 is closed, the switch is turned on by being pushed by the cover 15, thereby rotating the motor 22 of the fan 20 and driving the actuator 55. to move the shutter plate 50 to the open position (position to open the outdoor inlet 12a).

A battery (not shown) is accommodated in the device main body 10 . This battery is charged by a non-contact (wireless) power supply system. Briefly, as shown in FIG. 5A, a power receiving section 81 is provided on the indoor side of the right end of the device main body 10, and a power transmitting section 82 is provided on the window frame 1. As shown in FIG. When the sash door 2 is in the closed state, the battery is charged from the power transmission section 82 via the power reception section 81 .

The operation of the ventilator having the above configuration will be described. When the cover 15 is closed, the outdoor inlet 12a is open, and the fan 20 is rotating, the outdoor air is introduced from the left and right outdoor inlets 12a and passes through the outdoor air passage 37 to the left and right of the fan 20. is sucked into the suction port 24 of the At the same time, the indoor air is introduced from the left and right indoor side introduction ports 13 a and sucked into the left and right suction ports 24 of the fan 20 through the indoor air passage 38 .

The sucked outdoor air and indoor air are mixed in the fan 20, and the mixed air is blown indoors from the outlet 25 of the fan 20 through the outlet 15a of the front wall 11. - 特許庁Since the blown mixed air contains not only the outdoor air but also the indoor air, the cold outdoor air can be softened by the warm indoor air when the indoor air is heated during cold weather. can be prevented from occurring, and cold air can be prevented from being applied to the feet of the occupants.
In this embodiment, the amount of outdoor air drawn is greater than that of indoor air, eg, 7:3, and good ventilation can be achieved.

Since the outdoor air passage 37 and the indoor air passage 38 are separated by the partition wall consisting of the first partition wall portion 35 and the second partition wall portion 36 up to the suction port 24 of the fan 20, the outdoor air and the indoor air are separated. Mixing does not occur all the way to the suction port 24 of the fan 20 . Therefore, it is possible to prevent the ratio of the intake amount of outdoor air from becoming abnormally high (the ratio of the intake amount of indoor air from becoming abnormally low) due to the influence of the outdoor wind pressure. cold air can be reliably prevented.

Particularly in this embodiment, the outdoor air passage 37 and the indoor air passage 38 are separated by the fan-side passage portions 37a and 38a by the first partition wall 35 parallel to the rotation axis of the fan 20, so that the outdoor air and the indoor air are separated from each other. Air is drawn into the inlet 24 along the axis of rotation. Therefore, mixing of the two can be prevented more reliably.
In addition, since the outdoor air passage 37 has a retention chamber 37b connected to the outdoor side inlet 12a, the retention chamber 37b serves as a buffer to reduce the effects of sudden fluctuations in outdoor wind pressure.

Since the indoor-side inlet 13a is formed in the bottom wall 13, it is possible to make the intake direction and the blow-out direction of the indoor air different, thereby preventing the blown-out mixed air from being immediately introduced into the indoor-side inlet 13a. can be avoided.

Dust containing pollen contained in the outdoor air is removed when the outdoor air passes through the outdoor filter section 47, and dust containing pollen contained in the indoor air is removed when the indoor air passes through the indoor filter section 48. Therefore, clean mixed air can be blown out from the blow-out port 15a.

When maintenance of the fan 20 or replacement of the filter 40 is required, the cover 15 is opened. Since the motor 22 of the fan 20 is screwed to the indoor surface of the case 21, it can be easily removed from the case 21 together with the blades 23 by removing the screws.
The filter 40 can be easily pulled out by pinching the knob 45 and pulling it out along the second partition wall portion 36 . A new filter 40 can also be easily set as previously described.

In the above embodiment, the ventilator according to the present invention is used alone, but it can also be used in a constant ventilation system equipped with a ventilator with an exhaust fan. In this ventilation system, for example, an exhaust fan is installed in a sash window of a toilet or a bathroom, and a ventilation device according to the present invention is installed in a sash door of a living room. In this ventilation system, an exhaust fan exhausts indoor air to the outdoors, creates a negative pressure indoors, and guides the outdoor air indoors. Thus, since the exhaust fan can mainly play the role of ventilation, the ventilator according to the present invention can only play the role of mixing the indoor air to mitigate the outdoor cold air supplied to the living room. good. In this case, the output of the fan of the ventilation device according to the present invention can be smaller than that of the exhaust fan.

The present invention is not limited to the above-described embodiments, and various aspects are possible.
The edge of the partition wall and the inlet of the fan may be spaced slightly apart so that outdoor air and indoor air do not mix at the inlet.

INDUSTRIAL APPLICABILITY The present invention can be applied to a ventilation system that uses a fan to blow outdoor air indoors.

3 Ventilator 10 Device main body 11 Front wall 11a Opening 12 Rear wall 12a Outdoor side inlet 13 Bottom wall 13a Indoor side inlet 15 Cover 15a Blowout port 20 Fan 24 Suction port 30 Ventilation guide 35 First partition wall (partition wall)
36 Second partition wall (partition wall)
36a communication port 37 outdoor air passage 37a fan side passage portion 37b retention chamber 38 indoor air passage 38a fan side passage portion 38b space 39 filter insertion port 40 filter 47 outdoor side filter portion 48 indoor side filter portion 49 boundary portion 50 shutter plate 55 actuator 70 switch

Claims (7)

a hollow device main body having an outdoor side inlet for introducing outdoor air, an indoor side inlet for introducing indoor air, and an outlet for blowing mixed air of outdoor air and indoor air;
a fan installed in the main body of the device, sucking the outdoor air and the indoor air from the suction port and discharging mixed air of the outdoor air and the indoor air to the outlet;
In a ventilation system comprising
an outdoor air passage further comprising a partition wall disposed in the device main body and extending to the suction port of the fan, wherein the partition wall guides outdoor air from the outdoor side introduction port to the suction port; an indoor air passage that guides indoor air from the indoor-side inlet to the suction port is isolated;
the apparatus main body is elongated, and the rotational axis of the fan extends along the longitudinal direction of the apparatus main body;
The partition wall includes a first partition wall portion extending in the longitudinal direction of the device main body and having one end reaching the suction port of the fan, and a second partition wall portion at least partially extending in a direction crossing the longitudinal direction of the device main body. and a partition wall,
A ventilator, wherein the outdoor air passage and the indoor air passage each have a fan-side passage portion separated by the first partition wall . A filter insertion port for detachably inserting a filter is formed between the other end of the first partition wall and the second partition wall,
The filter includes an outdoor filter portion arranged at an open end opposite to the suction port in the fan side passage portion of the outdoor air passage , and the suction port in the fan side passage portion of the indoor air passage . and an indoor filter portion arranged at the open end on the opposite side, and a boundary portion between the outdoor filter portion and the indoor filter portion is arranged at the filter insertion port. Item 1. The ventilator according to item 1. The device main body has a retention chamber connected to the outdoor side introduction port,
The second partition wall slopes toward the outside so as to approach the fan, crosses the internal space of the apparatus body, and separates the fan-side passage portion of the indoor air passage from the retention chamber. ,
A communication port is formed in the second partition wall portion for communicating between the fan-side passage portion of the outdoor air passage and the retention chamber. contains a room,
The outdoor side filter portion and the indoor side filter portion are on two planes that intersect with each other, whereby the filter has a bent shape,
The outdoor side filter section is arranged along the second partition wall section, the indoor side filter section is arranged to be inclined in a direction intersecting the second partition wall section, and the second partition wall section and the indoor 3. The ventilator according to claim 2 , wherein the indoor side introduction port is arranged between the inner filter portion. The device main body includes a front wall facing indoors and a rear wall facing outdoors, the rear wall being formed with the outdoor side introduction port, and the front wall exposing the fan and the filter. is formed, and this opening is opened and closed by a cover rotatably supported by the main body of the apparatus. has
Further, a switch that responds to opening and closing operations of the cover is arranged on the device body, and this switch rotates the fan when the cover is in the closed position, and rotates the fan when the cover is in the open position. 4. A ventilator according to claim 2 or 3 , characterized in that it is stopped. a shutter plate arranged along the back wall of the apparatus main body; an actuator for moving the shutter plate between an open position for opening the outdoor side inlet and a closed position for closing the outdoor side inlet; with
The switch drives the actuator to open the shutter when the cover is closed, and drives the actuator to close the shutter when the cover is opened. 5. The ventilator according to Item 4 . a hollow device main body having an outdoor side inlet for introducing outdoor air, an indoor side inlet for introducing indoor air, and an outlet for blowing mixed air of outdoor air and indoor air;
a fan installed in the main body of the device, sucking the outdoor air and the indoor air from the suction port, and discharging mixed air of the outdoor air and the indoor air to the outlet;
In a ventilation system comprising
an outdoor air passage further comprising a partition wall disposed in the apparatus main body and extending to the suction port of the fan, wherein the partition wall guides outdoor air from the outdoor side introduction port to the suction port; an indoor air passage that guides indoor air from the indoor-side inlet to the suction port is isolated;
The fan is installed in the central part of the device main body, has the suction port at both ends thereof, and includes the outdoor side inlet, the indoor side inlet, the outdoor air passage, the indoor air passage, and the partition. A ventilator, characterized in that walls are arranged on both sides of the fan. a hollow device main body having an outdoor side inlet for introducing outdoor air, an indoor side inlet for introducing indoor air, and an outlet for blowing mixed air of outdoor air and indoor air;
a fan installed in the main body of the device, sucking the outdoor air and the indoor air from the suction port, and discharging mixed air of the outdoor air and the indoor air to the outlet;
In a ventilation system comprising
an outdoor air passage further comprising a partition wall disposed in the apparatus main body and extending to the suction port of the fan, wherein the partition wall guides outdoor air from the outdoor side introduction port to the suction port; an indoor air passage that guides indoor air from the indoor-side inlet to the suction port is isolated;
The device main body includes a front wall facing indoors, a rear wall facing outdoors, and a bottom wall, wherein the rear wall is formed with the outdoor side inlet, and the bottom wall is provided with the indoor side inlet. wherein the air outlet is formed in the front wall.

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