JP2004163056A - Ventilation structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a ventilation structure capable of efficiently and stably ventilating a living room space using natural air even when the direction of the natural air changes in a building having the living room space. <P>SOLUTION: The ventilation structure 1 for ventilating the inside of the living room space 10 of the building B1 comprises an air supply duct 11 communicating from a wall surface intermediate section 1M between two adjacent outside corners 1C of the building B1 to the living room space 10, and an exhaust duct 12 communicating from the wall surfaces of the outside corners 1C to the living room space 10. The inside of the air supply duct 11 is preferably provided with a back-flow preventing damper 13 of the air supply duct for preventing the air in the living room space 10 from flowing to the outside. The inside of the exhaust duct 12 is preferably provided with a back-flow preventing damper 14 of the exhaust duct for preventing outside air from flowing into the living room space 10. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a ventilation structure of a building having a living room space.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, for example, an invention described in Patent Literature 1 has been devised as a ventilation structure using a natural wind in a building having a living room space such as an apartment house or an office building.
As shown in FIG. 6, in the ventilation structure 101 of the invention, the main air supply duct 112 and the main air exhaust duct 113 are provided so as to penetrate the building 110 in the horizontal direction, and the air supply of the main air supply duct 112 is performed. The ports 112a and 112b and the exhaust ports 113a and 113b of the main exhaust duct 113 are provided so as to open on two opposite outer walls of the building 110, respectively.
Further, a branch supply duct 114 branched from the main supply duct 112 and a branch exhaust duct 116 branched from the main exhaust duct 113 are provided so as to communicate with the living room space 111.
[0003]
Then, outside air flows into the main air supply duct 112 from the air supply port 112 a or 112 b according to the direction of the wind, and this outside air is supplied into the living room space 111 through the branch air supply duct 114. When there is no wind, the sensor 117 detects this and activates the fan 119 to allow the outside air to flow from the duct 118 into the main air supply duct 112.
Next, the air in the living room space 111 is pushed out by the branch exhaust duct 116, flows into the main exhaust duct 113, and is exhausted outside from the exhaust port 113b or 113a.
In this way, ventilation in the living room space 111 is performed using natural wind.
[0004]
[Patent Document 1]
Japanese Patent No. 2897873 (FIG. 1)
[0005]
[Problems to be solved by the invention]
However, the ventilation structure 101 described above exclusively uses the wind blown to the two opposing outer wall surfaces, and it is difficult to ventilate the living room space using the natural wind blown from a direction perpendicular to the two outer wall surfaces. .
Here, especially in high-rise apartment buildings, office buildings, commercial buildings, etc., the wind is received from all sides, so even if the wind direction changes, ventilation that can effectively utilize the natural wind to ventilate the living room space Structure is required.
[0006]
An object of the present invention is to provide a ventilation structure that can efficiently and stably ventilate a room space using a natural wind even in a building having a room space, even if the wind direction of the natural wind changes. It is to be.
[0007]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the invention according to claim 1 performs ventilation in the living room spaces 10, 20, and 30 of the buildings B1 to B3 as shown in, for example, FIGS. Ventilation structures 1-3,
Air supply ducts 11, 21, 31 communicating from the wall intermediate portions 1M, 2M, 3M between the two adjacent corners 1C, 2C, 3C of the buildings B1 to B3 to the living room spaces 10, 20, 30. When,
It is characterized in that exhaust ducts 12, 22, 32 communicating with the living room spaces 10, 20, 30 from the wall surfaces of the protruding corners 1C, 2C, 3C are provided.
Here, the living room space may be composed of one room, or may be air-permeable.
The living room space is not limited to a room that is continuously used by a resident, but refers to any room in a building.
[0008]
According to the invention as set forth in claim 1, the sum of the wind pressures applied to the wall intermediate portion between two adjacent projecting corners of the building is larger than the sum of the wind pressures received by the projecting corner wall for various wind directions. Therefore, outside air can be introduced into the living room space from the middle portion of the wall surface through the air supply duct, and air can be discharged from the living room space to the wall surface of the outside corner through the exhaust duct.
Therefore, it is possible to efficiently and stably ventilate the living room space using the natural wind without being influenced by the wind direction to the building.
[0009]
The invention according to claim 2 is, for example, as shown in FIGS. 1, 4 and 5, in the ventilation structures 1 to 3 according to claim 1,
Backflow prevention dampers (backflow prevention / air volume adjustment dampers) 13, 23, 33 provided in the air supply ducts 11, 21, 31 for preventing the air in the living room spaces 10, 20, 30 from flowing out to the outside. Is provided.
[0010]
According to the second aspect of the present invention, the backflow prevention damper provided in the air supply duct on the leeward side is closed, and the air in the living room space is prevented from flowing outside through this air supply duct.
Therefore, ventilation of the living room space can be performed more efficiently.
[0011]
The invention according to claim 3 is, for example, as shown in FIGS. 1, 4 and 5, in the ventilation structures 1 to 3 according to claim 1 or 2,
Backflow prevention dampers (backflow prevention / air volume adjustment dampers) 14, 24, 34 that are provided in the exhaust ducts 12, 22, 32 and prevent outdoor air from flowing into the living room spaces 10, 20, 30 are provided. It is characterized by being provided.
[0012]
According to the third aspect of the present invention, the backflow prevention damper provided in the exhaust duct on the windward side is closed, and the air is prevented from flowing into the living room from outside through the exhaust duct.
Therefore, ventilation of the living room space can be performed more efficiently.
[0013]
According to a fourth aspect of the present invention, there is provided a ventilation structure according to any one of the first to third aspects, for example, as shown in FIGS.
An air flow adjustment damper (backflow prevention / air volume adjustment damper) 13, which is provided in the air supply ducts 11, 21, 31 and / or the exhaust ducts 12, 22, 32, and stabilizes the air flow of the air flowing therethrough; 14, 23, 24, 33, and 34 are provided.
Here, the airflow adjustment damper may be provided in an air supply duct (or exhaust duct) so as to be in series with the above-described backflow prevention damper, or for example, a backflow prevention damper as shown in FIGS. A backflow prevention / air volume adjustment damper having a function may also be used.
[0014]
According to the invention described in claim 4, the airflow of the airflow passing through the inside of the air supply duct and / or the exhaust duct is stabilized by the airflow adjustment damper, and even if the wind pressure received by the building changes, the natural wind is reduced. Utilization can stably ventilate the room space.
[0015]
The invention according to claim 5 is, for example, as shown in FIGS. 1, 4 and 5, in the ventilation structure 1 to 3 according to any one of claims 1 to 4,
Auxiliary ducts 15, 25, 35 communicating from the wall surfaces of the buildings B1 to B3 to the living room spaces 10, 20, 30;
Sensors 16, 26, and 36 provided in the air supply ducts 11, 21, 31 and / or the exhaust ducts 12, 22, 32, and detecting the airflow of the airflow passing therethrough;
Provided in the auxiliary ducts 15, 25, and 35, when the airflow detected by the sensors 16, 26, and 36 is smaller than a predetermined value, the living room spaces 10, 20, and 20 are opened from the outside through the auxiliary ducts 15, 25, and 35. Ventilation fans 17, 27, 37 for supplying air into the interior 30 or discharging air from the interior space 10, 20, 30 to the outside are provided.
[0016]
According to the invention as set forth in claim 5, when the sensor detects that the airflow of the airflow passing through the air supply duct and / or the exhaust duct is smaller than a predetermined value, that is, sufficient for ventilating the living room space. When the strong natural wind is not blowing, the ventilation fan operates and air is introduced into the living room from outside through the auxiliary duct, or air is exhausted from inside the living room to the outside.
Therefore, even when the natural wind is weak or when there is no wind, the room space can be properly ventilated.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, preferred embodiments of the present invention will be specifically described with reference to the drawings.
[0018]
As shown in FIGS. 1, 4, and 5, three types of ventilation structures 1 to 3 according to the present embodiment are high-rise office buildings each having a substantially square, star-shaped, or equilateral triangle planar shape. In order to ventilate the living room spaces 10, 20, and 30 such as the office rooms B1 to B3, they are installed behind the ceiling of each of the living room spaces 10, 20, and 30.
Here, the living room space may be composed of two or more rooms that can be ventilated from each other (for example, two or more rooms partitioned by a door with an undercut or a door with a bar).
[0019]
In each of the ventilation structures 1 to 3, as shown in FIGS. 1, 4, and 5, a wall surface intermediate between two adjacent corners 1C, 2C, and 3C that are adjacent to each other on each plane of the buildings B1 to B3. The air supply ducts 11, 21, 31 communicating from the sections 1M, 2M, 3M to the living room spaces 10, 20, 30 and the living room spaces 10, 20, An exhaust duct 12, 22, 32 communicating with 30 is provided.
[0020]
In addition, as shown in FIGS. 1, 4, and 5, living room spaces 10, 20, 30 are provided in the air supply ducts 11, 21, 31 of the ventilation structures 1 to 3, as shown in FIGS. A backflow prevention / airflow adjustment damper (backflow prevention damper, airflow adjustment damper) 13 for preventing the air inside from flowing out to the outside and stabilizing the airflow of the outside air supplied from the outside to the living room spaces 10, 20, 30 , 23, 33 are provided.
[0021]
Similarly, in the exhaust ducts 12, 22, 32 of the ventilation structures 1 to 3, outdoor air is passed through the exhaust ducts 12, 22, 32, as shown in FIGS. Backflow prevention / airflow adjustment dampers (backflow prevention dampers, airflow adjustment dampers) 14, which prevent the airflow into the insides 20, 30 and stabilize the airflow of the air discharged from the living room spaces 10, 20, 30 to the outside. 24 and 34 are provided.
[0022]
Here, the backflow prevention / air volume adjustment dampers 13, 14, 23, 24, 33, 34 will be described with reference to FIGS.
As shown in FIG. 2, the backflow prevention / air volume adjustment dampers 13, 14, 23, 24, 33, 34 are connected to the air supply ducts 11, 21, 31 or the exhaust ducts 12, 22, 32 to supply air. A cylindrical frame member 131 constituting a part of the ducts 11, 21, 31 or the exhaust ducts 12, 22, 32; a main blade 132 formed in a disk shape corresponding to the inner diameter of the frame member 131; An auxiliary blade 134 formed in a semi-circular shape corresponding to the inner diameter of 131 is provided.
[0023]
The main blade 132 is attached to the inside of the frame member 131 via a main blade rotation shaft 133 orthogonal to the axial direction of the frame member 131, and can be smoothly rotated around the main blade rotation shaft 133. ing.
A main blade stopper 137 is provided on the upper inner surface of the frame member 131. At a point immediately before the main blade 132 closes the internal space of the frame member 131, the main blade 132 rotates clockwise in FIGS. It is becoming regulated.
[0024]
When the leeward side of the wind direction in the steady state from the main blade rotation shaft 133 of the main blade 132 is the upper operation unit 132a, the leeward side is the lower operation unit 132b (see FIGS. 2 and 3), and the upper operation unit 132a is the lower operation The main blade rotation shaft 133 is set at a position slightly shifted from the center of gravity of the main blade 132 so as to be slightly heavier than the portion 132b side.
Therefore, in a state of no wind or a small air flow where the main blade 132 receives almost no wind resistance, the main blade 132 tends to rotate counterclockwise, but this rotation is performed at a position where the main blade 132 is substantially horizontal. A small air volume stopper 139 such as a screw is provided on the inner surface of the frame member 131 so as to restrict the movement.
[0025]
The auxiliary blade 134 is attached to the inside of the frame member 131 via an auxiliary blade rotation shaft 135 substantially coinciding with the main blade rotation shaft 133, and can be smoothly rotated around the auxiliary blade rotation shaft 135. ing.
An auxiliary blade stopper 138 is provided on the lower inner surface of the frame member 131, and the auxiliary blade 134 closes the lower part of the internal space of the frame member 131 below the auxiliary blade rotation shaft 135 in FIGS. 2 and 3. The counterclockwise rotation of the blade 134 is regulated. Therefore, the auxiliary blade 134 can smoothly rotate in a region on the left side of the auxiliary blade stopper 138.
The auxiliary blade 134 hangs down from the auxiliary blade rotation shaft 135 until it receives a wind pressure of a certain value or more from the right side. Further, even if wind pressure is received from the left side in FIGS.
[0026]
As described above, the upper operating portion 132a of the main blade 132 is set slightly heavier than the lower operating portion 132b so that the upper operating portion 132a is lowered in the state of no wind and at the time of the small air volume. This may be realized by slightly shifting the position of the main blade rotating shaft 133 with respect to the main blade 132 from the center of the main blade 132, or by providing a weight (not shown) on the upper operation unit 132a. Is also good.
[0027]
The operation of the thus configured backflow prevention / air volume adjustment dampers 13, 14, 23, 24, 33, 34 will be described with reference to FIG. Here, the wind from the leeward side (the right side in FIG. 3) of the wind direction in a steady state is called a forward airflow, and the wind from the leeward side (the left side in FIG. 3) is called a reverse airflow. Further, the description of the magnitude of the air volume is based on the forward airflow.
[0028]
When the air volume inside the air supply ducts 11, 21, 31 or the exhaust ducts 12, 22, 32 is zero or small, the upper operating portion 132a side of the main blade 132 is heavier than the lower operating portion 132b side. 3A, the rotation is regulated by the small air volume stopper 139, and the main blade 132 is substantially horizontal. In addition, the auxiliary blade 134 has not reached the critical air flow rate at which the auxiliary blade 134 separates from the auxiliary blade stopper 138, and the auxiliary blade 134 remains hanging downward. Thereby, the wind blows through the upper space of the main blade 132.
[0029]
When the inside of the air supply ducts 11, 21, 31 or the exhaust ducts 12, 22, 32 has a small air volume to a medium air volume, the auxiliary blade 134 receives a wind pressure of a certain value or more from the right side. Then, when the auxiliary blade 134 reaches a critical air flow rate at which the auxiliary blade 134 separates from the auxiliary blade stopper 138, the auxiliary blade 134 rotates clockwise about the auxiliary blade rotation shaft 135, as shown in FIG. A gap is created between the auxiliary blade 134 and the lower inner surface of the frame member 131. Thereby, the wind blows through the upper space of the main blade 132 and the lower space of the auxiliary blade 5.
Further, as shown in FIG. 3 (c), the main blade 132 is rotated clockwise by the wind receiving portion 136 formed on the lower surface of the main blade 132 being pushed up by the auxiliary blade 134.
[0030]
When the upper operating portion 132a of the main blade 132 slightly moves upward due to the clockwise rotation of the main blade 132, the upper space of the main blade 132 in the frame member 131 moves to the right side as shown in FIG. To the left. As a result, the flow velocity of the wind passing through the upper space gradually increases from the right side to the left side, and a larger lift acts on the upper operation part 132a than the lift acting on the lower operation part 132b.
In this way, the amount of air flowing inside the air supply ducts 11, 21, 31 or the exhaust ducts 12, 22, 32 increases, and the lift reaches the critical air flow rate for rotating the main blades 132. Rotate clockwise. At the stage of transition from the medium air flow rate to the atmospheric flow rate, the main blade 132 rotates in a direction (clockwise) to close the frame member 131.
[0031]
When the amount of air flowing through the air supply ducts 11, 21, 31 or the exhaust ducts 12, 22, 32 further increases, the main blade 132 rotates clockwise and the main blade stopper 137 as shown in FIG. And the air flow passing above and below the main blade 132 is significantly reduced. Then, the lift acting on the upper operating portion 132a and the lower operating portion 132b decreases, and the difference in the lifts also decreases, so that the main blade 132 rotates slightly to the opposite side and the airflow passing above and below the main blade 132 is slightly reduced. To increase. Then, the upper operating portion 132a receives the lift again, and the main blade 132 slightly rotates in the direction in which the frame member 131 is closed, so that the air flow passing above and below the main blade 132 decreases. Thereafter, these operations are repeated while gradually attenuating, and the air flow is stabilized.
[0032]
At the time of the reverse airflow, as shown in FIG. 3 (e), an air pool occurs in the lower space of the upper operation unit 132a, and the lower surface of the upper operation unit 132a receives the wind pressure and rises upward. As shown in (f), the main blade 132 rotates clockwise until it comes into contact with the main blade stopper 137, and the frame member 131 is closed by the main blade 132 and the auxiliary blade 134. Therefore, the air flow passing through the air supply ducts 11, 21, 31 or the exhaust ducts 12, 22, 32 becomes substantially zero, and the backflow is prevented.
[0033]
In addition, in each of the ventilation structures 1 to 3, as shown in FIGS. 1, 4, and 5, auxiliary ducts 15, 25, and 35 that communicate from the wall surfaces of the buildings B1 to B3 to the living room spaces 10, 20, and 30 are provided. Have been.
On the other hand, sensors 16, 26, and 36 are provided in the air supply ducts 11, 21, 31 and the exhaust ducts 12, 22, 32 to detect the airflow of the airflow passing therethrough.
The auxiliary ducts 15, 25, and 35 receive signals transmitted from the sensors 16, 26, and 36 when the airflow detected by the sensors 16, 26, and 36 is smaller than a predetermined value. , 35 are provided with ventilation fans 17, 27, 37 for supplying air from outside to the interior spaces 10, 20, 30.
[0034]
As described above, according to the ventilation structures 1 to 3 described in the present embodiment, the sum of the wind pressures received by the wall intermediate portions 1M to 3M between the two adjacent corners 1C to 3C of the buildings B1 to B3 is: For various wind directions, the sum of the wind pressures applied to the wall surfaces of the outgoing corners 1C to 3C is often larger than the sum of the wind pressures. , 30 and the air can be discharged from the living room spaces 10, 20, 30 to the wall surfaces of the corners 1C to 3C through the exhaust ducts 12, 22, 32.
Therefore, it is possible to efficiently and stably ventilate the living room spaces 10, 20, and 30 using natural winds without being affected by the wind direction to the buildings B1 to B3.
In particular, in the buildings B2 and B3, since the planar shapes of the corners 2C and 3C are acute angles, the air pressure around the corners 2C and 3C is lower than the air pressure around the wall intermediate parts 2M and 3M. Negative pressure easily occurs and ventilation efficiency can be increased.
[0035]
In addition, the backflow prevention / air volume adjusting dampers 13, 23, 33 provided in the air supply ducts 11, 21, 31 on the leeward side are closed, and through the air supply ducts 11, 21, 31, the interior of the living room space 10, 20, 30 is opened. Is prevented from leaking to the outside.
Therefore, the ventilation of the living room spaces 10, 20, 30 can be performed more efficiently.
[0036]
In addition, the backflow prevention / air volume adjustment dampers 14, 24, 34 provided in the exhaust ducts 12, 22, 32 on the windward side are closed, and through the exhaust ducts 12, 22, 32, the interior of the living room spaces 10, 20, 30 are opened. Is prevented from flowing into the air.
Therefore, the ventilation of the living room spaces 10, 20, 30 can be performed more efficiently.
[0037]
Further, the airflow of the airflow passing through the air supply ducts 11, 21, 31 and / or the exhaust ducts 12, 22, 32 is stabilized by the backflow prevention / airflow adjustment dampers 13, 14, 23, 24, 33, 34. Even if the wind pressure applied to the buildings B1, B2, and B3 changes, the ventilation of the living room spaces 10, 20, and 30 can be stably performed using the natural wind.
[0038]
Further, when it is detected by the sensors 16, 26, 36 that the airflow of the airflow passing through the air supply duct and / or the exhaust duct is smaller than a predetermined value, that is, sufficient for ventilating the living room spaces 10, 20, 30. When the natural wind of a high intensity is not blowing, the ventilation fans 17, 27, 37 are operated, and air is introduced from outside into the room spaces 10, 20, 30 through the auxiliary ducts 15, 25, 35, or Air is discharged from the spaces 10, 20, 30 to the outside.
Therefore, even when the natural wind is weak or when there is no wind, the ventilation of the living room spaces 10, 20, 30 can be appropriately performed.
[0039]
It should be noted that the present invention is not limited to the above embodiment, and various improvements and design changes may be made without departing from the spirit of the present invention.
For example, the backflow prevention damper and the airflow adjustment damper are not limited to those having the above-described configurations. It may have a simple structure.
Further, the backflow prevention damper and the air volume adjustment damper may be provided separately, and these may be provided in series in an air supply duct (exhaust duct).
In addition, it is needless to say that specific detailed structures and the like can be appropriately changed.
[0040]
【The invention's effect】
According to the invention described in claim 1, the sum of the wind pressures applied to the wall intermediate portion between the two adjacent corners of the building is larger than the sum of the wind pressures received by the corner wall for various wind directions. Therefore, outside air can be introduced into the living room space from the middle portion of the wall surface through the air supply duct, and air can be discharged from the living room space to the wall surface of the outside corner through the exhaust duct.
Therefore, it is possible to efficiently and stably ventilate the living room space using the natural wind without being influenced by the wind direction to the building.
[0041]
According to the invention described in claim 2, in addition to the effect obtained by the invention described in claim 1, the backflow prevention damper provided in the air supply duct on the leeward side is closed, and through the air supply duct, the inside of the living room space is opened. The advantage is obtained that the air is prevented from flowing out to the outside.
Therefore, ventilation of the living room space can be performed more efficiently.
[0042]
According to the third aspect of the present invention, in addition to the effects obtained by the first or second aspect of the present invention, the backflow prevention damper provided in the exhaust duct on the windward side is closed, and the living room is opened from outside through the exhaust duct. This has the advantage that air is prevented from flowing into the space.
Therefore, ventilation of the living room space can be performed more efficiently.
[0043]
According to the fourth aspect of the invention, in addition to the effects obtained by the first aspect of the invention, the airflow of the airflow passing through the inside of the air supply duct and / or the exhaust duct is controlled by the airflow adjustment damper. Therefore, even if the wind pressure applied to the building changes, an advantage is obtained in that the ventilation of the living room can be stably performed using the natural wind.
[0044]
According to the invention described in claim 5, when the sensor detects that the airflow of the airflow passing through the air supply duct and / or the exhaust duct is smaller than a predetermined value, that is, sufficient for ventilating the living room space. When the strong natural wind is not blowing, the ventilation fan operates and air is introduced into the living room from the outside through the auxiliary duct, or air is exhausted from the inside of the living room to the outside.
Therefore, in addition to the effects obtained by the invention according to any one of claims 1 to 4, there is obtained an advantage that the ventilation of the living room space can be appropriately performed even when the natural wind is weak or when there is no wind.
[Brief description of the drawings]
FIG. 1 is a plan view showing an example of a ventilation structure according to the present invention.
FIG. 2 is a schematic diagram showing a structure of an air volume adjustment damper (supply (exhaust) duct backflow prevention damper) in FIG. 1;
FIG. 3 is a cross-sectional view showing an operation of the air volume adjustment damper shown in FIG.
FIG. 4 is a plan view showing another example of the ventilation structure according to the present invention.
FIG. 5 is a plan view showing still another example of the ventilation structure according to the present invention.
FIG. 6 is a sectional view showing an example of a conventional ventilation structure.
[Explanation of symbols]
1-3 Ventilation structure 1C, 2C, 3C Outer corner 1M, 2M, 3M Intermediate part 10, 20, 30 Living room space 11, 21, 31 Air supply duct 12, 22, 32 Air exhaust duct 13, 14, 23, 24, 33, 34 Backflow prevention / air volume adjustment damper (backflow prevention damper, air volume adjustment damper)
15, 25, 35 Auxiliary ducts 16, 26, 36 Sensors 17, 27, 37 Fans B1 to B3 Building

Claims (5)

A ventilation structure for ventilating the interior space of the building,
An air supply duct that communicates with the living room space from a middle wall portion between two adjacent corners of the building,
A ventilation structure, comprising: an exhaust duct that communicates with the living room space from a wall surface at the corner. 2. The ventilation structure according to claim 1, further comprising a backflow prevention damper provided in the air supply duct and configured to prevent air in the living room space from flowing outside. 3. The ventilation structure according to claim 1, further comprising a backflow prevention damper provided in the exhaust duct and configured to prevent outdoor air from flowing into the living room space. 4. 4. An air flow adjusting damper provided in the air supply duct and / or the exhaust duct to stabilize the air flow of the airflow passing therethrough, is provided. Ventilation structure described in. An auxiliary duct communicating from the wall surface of the building to the living room space,
A sensor that is provided in the air supply duct and / or the exhaust duct, and that detects a flow rate of an airflow passing through the inside of the air supply duct and / or the exhaust duct;
A ventilation fan that is provided in the auxiliary duct and supplies air from outside to the living room space or discharges air from inside the living room space to the outside when the air volume detected by the sensor is smaller than a predetermined value. The ventilation structure according to any one of claims 1 to 4, wherein the ventilation structure is provided.

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