JP2023139843A - Dwelling house - Google Patents

Abstract

To suppress air from flowing into other spaces in a building from a predetermined room.SOLUTION: A dwelling house comprises: a first area A1 having an independent private room 14 that can directly supply air from an outside and exhaust air to the outside with an exhaust fan 51; a second area A2 having a common area adjacent to the first area; and a third area A3 having a living area 21 adjacent to the second area. The third area has a more positive pressure than those in the first area and the second area. An air flow from the third area toward the second area is formed. A door D1 that can be opened and closed is provided between the first area and the second area, and when the first fitting is closed, air circulation between the first area and the second area is blocked.SELECTED DRAWING: Figure 1

Description

The present invention relates to housing.

BACKGROUND ART In recent years, in addition to rooms such as living rooms and dining rooms where families gather, houses are sometimes provided with highly independent living rooms (independent private rooms) that are used by specific people. For example, an independent private room may be used as a work room (see Patent Documents 1 and 2 below) or as a medical treatment room for people living together.

Japanese Patent Application Publication No. 3-286072 Japanese Patent Application Publication No. 2003-161046

When used as a medical treatment room, it is desirable to control the flow of air to other spaces for hygiene management reasons.

Therefore, the present invention has been made in view of the above-mentioned circumstances, and provides a house that can suppress air from flowing into other spaces in the dwelling unit from a predetermined room.

In order to achieve the above object, the present invention employs the following means.
That is, the house according to the present invention includes a first region having an independent private room that can directly supply air from the outside and exhaust air to the outside with an exhaust fan, and a second region having a common area adjacent to the first region. a third area having a living room adjacent to the second area, the third area having a more positive pressure than the first area and the second area, and the third area having a living area adjacent to the second area; A first fitting that can be opened and closed is disposed between the first area and the second area, and when the first fitting is in the closed state, a flow of air is formed between the first area and the second area. Air circulation between the second area and the second area is blocked.

In houses configured in this way, the first area uses a ventilation method (class 3 ventilation) in which air is directly supplied from the outside and exhausted by an exhaust fan, so the air in the first area is transferred to the second area and The flow into the third region is suppressed. In addition, since the third region has a more positive pressure than the second region, an airflow (flow of air) is formed from the third region to the second region, and air flows from the second region to the third region. is suppressed. That is, it is possible to suppress air from the first region from flowing into the third region.

Further, in the house according to the present invention, a wall is provided around the first area to partition it from other spaces in the house, and the wall includes a wall panel arranged from a floor slab to a ceiling slab. , a sealing material disposed between the lower end of the wall panel and the floor slab, and between the upper end of the wall panel and the ceiling slab.

In a house configured in this way, a sealant is placed between the lower end of the wall panel provided around the first area and the floor slab, and a sealant is placed between the upper end of the wall panel and the ceiling slab. A sealing material is placed in the area. Therefore, since the gaps between the wall panel and the floor slab and ceiling slab are sealed, when the first fitting is in the closed state, air circulation between the first area and other areas is reliably suppressed. be able to.

Further, in the house according to the present invention, a second fitting that can be opened and closed is arranged between the second area and the third area, and the second fitting has ventilation that allows air to circulate. A space may be formed.

In a house configured in this way, since the second fitting has a ventilation space that allows air to circulate, the air in the third area can be transferred to the third area through the ventilation space regardless of the open/closed state of the fitting. It can be made to flow into two areas.

Further, in the house according to the present invention, the exhaust fan that exhausts the first area and the exhaust fan that exhausts the second area may be a common exhaust fan.

In a house configured in this way, the number of exhaust fans can be reduced, so costs can be reduced and the system can be operated efficiently.

Moreover, in the house according to the present invention, the opening that enters and exits the first area may be only the first fitting.

In a house configured in this way, the first fitting is the only opening that enters and leaves the first area. Can be limited to parts.

Further, in the house according to the present invention, an external corridor is provided adjacent to the dwelling unit, and the exhaust duct for exhausting the first area extends to the outer wall beyond the external corridor. Good too.

In a house configured in this manner, the exhaust air in the first region can be exhausted outward from the outer wall, so that it is possible to prevent the exhausted air from being supplied into the housing unit again.

Moreover, in the house according to the present invention, air may be supplied to the third area using at least an air supply fan.

In a house configured in this way, it is possible to maintain positive pressure in the third area more easily than in other areas, and to more reliably suppress air being drawn in from the second area (and the first area). I can do it.

According to the house according to the present invention, it is possible to suppress air from flowing into other spaces from a predetermined room.

1 is a plan view showing a house according to an embodiment of the present invention. FIG. 2 is an elevational view schematically showing the configuration of walls installed around a first area of a house according to an embodiment of the present invention. FIG. 3 is an elevational view schematically showing the configuration of second fittings of a house according to an embodiment of the present invention. FIG. 2 is a plan view illustrating the flow line of non-infected people in a house according to an embodiment of the present invention. FIG. 2 is a plan view illustrating the flow line of an infected person in a house according to an embodiment of the present invention.

A house according to an embodiment of the present invention will be described using drawings. FIG. 1 is a plan view showing a house according to an embodiment of the present invention. As shown in FIG. 1, a house 1 according to the present embodiment is, for example, a single unit in an apartment complex. Note that the house 1 may be a detached house, and the arrangement of each room described below is an example.

For convenience, the horizontal direction of the paper shown in FIG. 1 is defined as the X direction, the right side is defined as the +X side, and the left side is defined as the -X side. The vertical direction of the paper shown in FIG. 1 is the Y direction, the upper side is the +Y side, and the lower side is the −Y side.

An entrance 11 is arranged on the +X side of the house 1 and in the middle in the Y direction. A hallway 12 is arranged to extend from the entrance 11 in the -X direction.

An independent private room 14 is arranged adjacent to the +Y side of the hallway 12. A walk-in closet 15 is arranged on the −X side of the independent private room 14. A door D1 is provided between the independent private room 14 and the hallway 12. An independent private room 14 and a walk-in closet 15 constitute a first area A1.

A washroom 16 is arranged adjacent to the -Y side of the hallway 12. A door D2 is provided between the washroom 16 and the hallway 12. A toilet 17 is arranged adjacent to the washroom 16. A door D3 of the toilet 17 is arranged facing the washroom 16. A dressing room 18 is arranged adjacent to the +X side of the washroom 16, and a bathroom 19 is arranged adjacent to the +X side of the dressing room 18. The entrance 11, the hallway 12, the washroom 16, the toilet 17, the changing room 18, and the bathroom 19 constitute the second area A2.

A kitchen 20 is arranged adjacent to the -X side of the washroom 16. A door D4 is provided between the washroom 16 and the kitchen 20. A living/dining room 21 is arranged adjacent to the -X side of the kitchen 20. On the +Y side of the living/dining room 21, a workspace 22, a private room 23, and a private room 24 are arranged in order from the +X side to the -X side. A door D5 is provided between the hallway 12 and the living/dining room 21. The kitchen 20, living/dining room 21, work space 22, private room 23, and private room 24 constitute the third area A3.

A wall W1 is provided between the first area A1 and the second area A2. A wall W2 is provided at the boundary between the first area A1 and the third area A3.

FIG. 2 is an elevational view schematically showing the configuration of walls W1 and W2. The walls W1 and W2 will be collectively referred to as a wall W. As shown in FIG. 2, the wall W has a wall panel 31. As shown in FIG. The wall panel 31 is formed into a flat plate shape. The plate surface of the wall panel 31 is arranged along a vertical plane. The wall panel 31 is arranged from the floor slab 32 to the ceiling slab 33.

A slight gap is formed between the lower end 31d of the wall panel 31 and the floor slab 32. A sealing material 35 is provided between the lower end 31d of the wall panel 31 and the floor slab 32. A slight gap is formed between the upper end 31u of the wall panel 31 and the ceiling slab 33. A sealing material 35 is provided between the upper end 31u of the wall panel 31 and the ceiling slab 33. The sealing material 35 closes the gap and prevents air from flowing through the gap.

As shown in FIG. 1, a door D1 is provided between the hallway 12 and the independent private room 14. Door D1 does not have a ventilation space like doors D2 to D5, which will be described later. That is, when the door D1 is in the closed state, the corridor 12 and the independent private room 14 are configured to be airtight so that no air flows between them. In other words, by closing the door D3, it is possible to block the inflow and outflow of air from other rooms to the independent private room 14, and the air supply and exhaust to the independent private room 14 can be performed independently. .

A door D2 is provided between the hallway 12 and the washroom 16. A door D3 is provided between the washroom 16 and the toilet 17. A door D4 is provided between the washroom 16 and the kitchen 20. Doors D2, D3, and D4 are all constructed of sliding doors. The doors D2, D3, and D4 are provided with undercuts or louvers, allowing air to circulate between the rooms on both sides of the doors D2, D3, and D4.

A door D5 is provided between the hallway 12 and the living/dining room 21. FIG. 3 is an elevational view schematically showing the structure of the door D5. As shown in FIG. 3, the door D5 includes a door frame 36 and a door body 37. The door frame 36 is a three-sided frame having an upper frame and a pair of vertical frames. The door body 37 is attached to the door frame 36 via a hinge or the like (not shown), and is configured to open toward the living/dining room 21 side.

A ventilation space that allows air to circulate from the living/dining room 21 side to the hallway 12 side is formed in the door D2. The ventilation space is, for example, a gap (undercut) s1 formed between the floor surface F and the lower end of the door body 37. Moreover, an opening such as a louver passing through the door body 37 in the thickness direction (direction from the living/dining room 21 side to the hallway 12 side) may be formed as a ventilation space.

The house 1 is provided with a first air supply/exhaust system 40 and a second air supply/exhaust system 70. The first air supply/exhaust system 40 and the second air supply/exhaust system 70 do not supply/exhaust the same room, but are separate systems. In FIG. 1, a broken line arrow indicates an air supply route, and a solid line arrow indicates an exhaust route.

The first supply and exhaust system 40 supplies and exhausts the first area A1. The first air supply/exhaust system 40 includes a first air supply facility 41 and a first exhaust facility 46 .

The first air supply equipment 41 has an external air supply port 42 . The external air supply port 42 is, for example, an air supply register provided on the outer wall of the independent private room 14 and capable of adjusting the amount of air supply.

The first exhaust equipment 46 has an exhaust port 47 , an exhaust port 48 , and an exhaust port 49 . The exhaust port 47 is provided, for example, on the ceiling or wall of the independent private room 14. The exhaust port 48 is provided, for example, on the ceiling of the toilet 17. The exhaust port 49 is provided, for example, on the ceiling of the changing room 18. A duct 50 is connected to the exhaust port 47. The duct 50 is arranged in the ceiling and connected to an exhaust fan 51 provided in the ceiling of the bathroom 19. A duct 52 is connected to the exhaust port 48. The duct 52 is arranged in the ceiling and connected to an exhaust fan 51 provided in the ceiling of the bathroom 19. A duct 53 is connected to the exhaust port 49. The duct 53 is arranged in the ceiling and connected to an exhaust fan 51 provided in the ceiling of the bathroom 19. Air is supplied to the hallway 12 and washroom 16 from the living/dining room 21 and kitchen 20 through ventilation spaces of doors D4 and D5. The exhaust fan 51 is, for example, a 24-hour mechanical ventilation fan for sick house use.

An exhaust duct 54 is connected to the exhaust fan 51. The exhaust duct 54 is guided from the exhaust fan 51 to the outside of the residence, is arranged to cross the ceiling of the external hallway 55, and is configured to be exhausted from the outer wall 56 of the residence 1.

The exhaust duct 53 may be provided with a backflow prevention damper (not shown). By providing a backflow prevention damper, it is configured to suppress the recirculation of the exhausted air in the independent private room 14 into the house 1.

The first region A1 supplies air into the independent private room 14 via the external air supply port 42. The air in the independent private room 14 is forcibly drawn in through the exhaust port 47 by the exhaust fan 51, passes through the ducts 50 and 54, and is exhausted to the outside of the house 1. In this way, the independent private room 14 can be directly connected to the outside of the house 1.

The second area A2 supplies air from the kitchen 20 to the washroom 16 through the ventilation space of the door D4, and from the living/dining room 21 to the hallway 12 through the door D5. The air supplied to the hallway 12 flows into the washroom 16 through the ventilation space of the door D2. A part of the air that has flowed into the washroom 16 flows into the toilet 17 through the ventilation space of the door D3. The air that has flowed into the toilet 17 is exhausted to the outside via the exhaust port 48. Further, a part of the air that has flowed into the washroom 16 flows into the changing room 18. The air that has flowed into the changing room 18 is exhausted to the outside through the exhaust port 49. Furthermore, some of the air that has flowed into the washroom 16 flows into the bathroom 19. The air that has flowed into the bathroom 19 is configured to be exhausted to the outside through an exhaust port (not shown) provided in the fan 51.

The first exhaust equipment 46 includes exhaust ports 47 , 48 , 49 , ducts 50 , 52 , 53 , an exhaust fan 51 , and an exhaust duct 54 .

The second air supply/exhaust system 70 has kitchen air supply/exhaust equipment 71 . The kitchen air supply/exhaust equipment 71 is provided, for example, in the range hood of the kitchen 20, and performs air supply/exhaust at the same time. The second air supply/exhaust system 70 of this embodiment further includes an air supply fan 72 for constantly supplying air to the kitchen 20.

The second air supply/exhaust system 70 supplies air not only to the kitchen 20 but also to the living/dining room 21. External air supply ports 73 and 74 are provided on the wall facing the balcony 61 of the house 1. The external air supply port 73 is provided on a wall facing the living/dining room 21. The external air supply port 74 is provided on the wall facing the private room 24. That is, air is supplied to the second area A2 via the third area A3 and the doors D4, D5, etc. from the air supply fan 72 and the external air supply ports 73, 74.

The kitchen air supply and exhaust equipment 71 includes a kitchen air supply equipment 75 and a kitchen exhaust equipment 76. The kitchen air supply equipment 75 takes in outside air from the balcony 61 and is connected to an air supply fan 72 via a duct 77 disposed in the ceiling, for example. An air supply duct 78 is connected to the air supply fan 72 . The air supply duct 78 is connected to an air supply port 79 of a range hood provided in the kitchen 20, and air is supplied into the room from the air supply port 79.

The kitchen exhaust equipment 76 has an exhaust port 80 provided in the range hood of the kitchen 20. An exhaust fan (not shown) is connected to the exhaust port 80. A duct 81 is connected to the exhaust fan. The duct 81 is disposed, for example, in the ceiling of the living/dining room 21 and is configured to exhaust air to the balcony 61.

The kitchen air supply equipment 75 is equipped with an air supply fan 72 and an air supply/exhaust type range hood, but instead of installing the air supply fan 72, a forced air supply type range hood is used in the range hood to constantly operate the kitchen. The structure may be such that air is supplied from 20 to the living/dining room 21.

The surplus air supplied to the third area A3 is configured to flow to the second area A2 via the ventilation spaces of the doors D4 and D5. In other words, since the third area A3 is maintained at a more positive pressure than the second area A2, air is suppressed from flowing into the third area A3 from the second area A2.

Here, an example of the ventilation air volume to each room will be explained.
The exhaust air volume of the independent private room 14 in the first area A1 is 31.5 m ³ /h in the 24-hour ventilation mode and 45.5 m ³ /h in the strong wind operation mode. The exhaust air volume of the toilet 17 and changing room 18 in the second area A2 is 41 m ³ /h in 24-hour ventilation mode and 61.5 m ³ /h in strong wind operation mode, and the exhaust air volume of the bathroom 19 is 41 m 3 /h in 24-hour ventilation mode. 47.5m ³ /h, 71m ³ /h in strong wind operation mode. That is, the entire exhaust air volume of the second region A2 is 88.5 m ³ /h in the 24-hour ventilation mode and 132.5 m ³ /h in the strong wind operation mode. The constant air supply amount in the third area A3 is 180 m ³ /h, and when the range hood in the kitchen 20 is used, it is 600 m ³ /h (constant ventilation 180 m ³ /h + kitchen air supply 420 m ³ /h). In addition, since the range hood has the same amount of air supply and exhaust air, the kitchen exhaust air is 420 m ³ /h.

In other words, the number of ventilations in the first area A1 is approximately 1.2 times/h in 24-hour ventilation mode, and the number of ventilations in the second area A2 and third area A3 is approximately 0.5 times/h in 24-hour ventilation mode. Become. In strong wind operation mode, it is possible to secure a higher ventilation frequency.

Next, we will explain the flow of people within a residential unit when a member of the family is infected with an infectious disease. As shown in FIG. 4, the non-infected person disinfects his or her hands with alcohol at the entrance 11 after returning home (step 1). After disinfection, for example, the user takes off his jacket and hangs it on a coat rack provided in the hallway 12 (step 2). Thereafter, the user passes through the door D2 and enters the washroom 16 (step 3). For example, the door D2 is designed to be able to be opened and closed without grasping the handle. Wash your hands in the washroom 16 (step 4), and change into loungewear in the washroom 16 (step 5). Thereafter, the user passes through doors D2 and D5 and enters the living and dining room 21 (steps 6 and 7). Alternatively, open the door D4 and enter the living/dining room 21 via the kitchen 20.

As shown in FIG. 5, the infected person lives in an independent private room 14. We will explain the flow line when an infected person goes to toilet 17 etc. The infected person opens door D1 and exits to hallway 12 (step 1). For example, the door D1 may be equipped with a doorknob that does not require the user to hold the handle when opening or closing the door. Pass through the door D2 from the hallway 12 and enter the washroom 16 (step 2). It is also preferable to adopt a door D2 that can be opened and closed without holding the handle. Wash your hands in the washroom 16 (step 3). Open the door D3 and enter the toilet 17 to relieve yourself (step 4). It is also preferable to adopt a door D3 that can be opened and closed without holding the handle. Before leaving the toilet 17, disinfection is performed using a disinfectant installed inside the toilet 17 (step 5). Open the door D3, return to the washroom 16, and wash your hands (step 6). The user passes through the door D2 and exits into the hallway 12 (step 7), and further passes through the door D1 to return to the independent private room 14 (step 8). With this configuration, even if an infected person uses the common area of the second area A2, it is possible to prevent infection to non-infected people as much as possible.

According to the house 1 of this embodiment, there is a first area A1 having an independent private room 14 that can directly supply air from the outside and exhaust air to the outside using an exhaust fan 51, a washroom 16 adjacent to the first area A1, etc. a second area A2 having a common area of A positive pressure is created, and a flow of air is formed from the third area A3 to the second area A2, and an openable/closable door (first fitting) D1 is provided between the first area A1 and the second area A2. When the door D1 is in the closed state, air circulation between the first area A1 and the second area A2 is blocked. In the house 1 configured in this way, since the first area A1 adopts a ventilation method (class 3 ventilation) in which air is directly supplied from the outside and exhausted by the exhaust fan 51, the air in the first area A1 is It is suppressed from flowing into the second area A2 and the third area A3. In addition, since the third area A3 has a more positive pressure than the second area A2, an airflow (flow of air) is formed from the third area A3 to the second area A2, and from the second area A2 to the third area Air is prevented from flowing into A3. That is, it is possible to suppress air from flowing into the first area A1 from the third area A3.

Further, a wall W (W1, W2) is provided around the first area A1 of the housing 1 to partition it from other spaces in the housing unit, and the wall W is arranged to extend from the floor slab 32 to the ceiling slab 33. A sealing material 35 is provided between the lower end 31d of the wall panel 31 and the floor slab 32, and between the upper end 31u of the wall panel 31 and the ceiling slab 33. There is. In the house 1 configured in this way, the sealing material 35 is arranged between the lower end 31d of the wall panel 31 of the wall W provided around the first area A1 and the floor slab 32, A sealing material 35 is arranged between the upper end portion 31u and the ceiling slab 33. Therefore, the gaps between the wall panel 31 and the floor slab 32 and ceiling slab 33 are sealed, so when the door D1 is in the closed state, air circulation between the first area A1 and the other areas A2 and A3 is prevented. can be reliably suppressed.

Further, a door (second fitting) D4 that can be opened and closed is arranged between the second area A2 and the third area A3, and a ventilation space that allows air to circulate is formed in the door D4. There is. In the house 1 configured in this way, since the door D4 has a ventilation space that allows air to circulate, the air in the third area A3 can be circulated through the ventilation space regardless of the open/closed state of the door D4. It can be made to flow into the second area A2.

Further, the configuration is such that the exhaust air from the first area A1 and the exhaust air from the second area A2 are exhausted by a common exhaust fan 51. In the house 1 configured in this way, the number of exhaust fans can be suppressed, so costs can be suppressed and maintenance can be performed efficiently.

Further, the opening for entering and exiting the first area A1 was configured only by the door D1. In the house 1 configured in this way, the door D1 is the only opening for entering and leaving the first area A1, so the flow of air flowing in and out of the first area A1 from inside the dwelling unit is directed to the opening where the door D1 is provided. can be limited to.

Further, an external hallway 55 is provided adjacent to the dwelling unit, and an exhaust duct 54 for exhausting air from the first area A1 extends to an outer wall portion 56 beyond the external hallway 55. In the housing 1 configured in this manner, the exhaust air from the first area A1 can be exhausted outward from the outer wall portion 56, so that it is possible to suppress the exhausted air from being supplied into the housing unit again. I can do it.

Furthermore, air is supplied to the third area A3 using at least the air supply fan 72. In the house 1 configured in this way, positive pressure can be maintained in the third area A3 more easily than in other areas, and air can be drawn in from the second area A2 (and first area A1) more reliably. can be suppressed to

According to this embodiment, for example, it is possible to reduce the risk that a family member who has been infected with, or who is concerned about being infected with, an infectious disease such as the new coronavirus, influenza, or norovirus will spread the infection within the household.

Note that the various shapes and combinations of the constituent members shown in the above-described embodiments are merely examples, and various changes can be made based on design requirements and the like without departing from the gist of the present invention.

For example, a sealing material 35 is provided at the upper and lower ends of the wall panel 31 of the wall W provided around the independent private room 14, and gaps between the wall panel 31, the floor slab 32, and the ceiling slab 33 are sealed. However, the present invention is not limited to this. The gaps between the wall panel 31 and the floor slab 32 and ceiling slab 33 do not need to be sealed with the sealant 35.

Further, although a gap (ventilation space) s1 through which air can circulate is formed in the door D5, the present invention is not limited to this. The gap s1 may not be formed in the door D5.

Further, although a sealable door D1 is provided between the hallway 12 and the independent private room 14, a front room may be provided between the hallway 12 and the independent private room 14.

Further, wiring and piping arranged from the independent private room 14 to other spaces in the house 1 may be sealed with a sealing material at the boundary between the independent private room 14 and other spaces. This prevents the air in the independent private room 14 from flowing into other spaces via wiring and piping.

The plan for house 1 is an example, and another plan may be used. All you need to do is create a zoning plan that limits areas where infection is a concern. In addition, it is sufficient to have a ventilation plan that prevents air from flowing back into other rooms from areas where infection is a concern.

1 House 11 Entrance (common area)
12 Corridor (common area)
14 Independent private room 16 Washroom (common area)
17 Toilet (common area)
18 Changing room (common area)
19 Bathroom (common area)
21 Living Dining (Living)
31 Wall panel 31d Lower end 31u Upper end 32 Floor slab 33 Ceiling slab 35 Sealing material 51 Exhaust fan 54 Exhaust duct 55 External corridor 56 External wall 72 Air supply fan A1 First area A2 Second area A3 Third area D1 Door (No. 1 fittings)
D4 Door (second fitting)
W1 (W) Wall W2 (W) Wall

Claims (7)

a first area having an independent private room that can directly supply air from the outside and exhaust air to the outside using an exhaust fan;
a second area having a common area adjacent to the first area;
a third area having a living room adjacent to the second area,
The third region has a more positive pressure than the first region and the second region,
An air flow is formed from the third region toward the second region,
A first fitting that can be opened and closed is arranged between the first region and the second region,
In the house, when the first fittings are in a closed state, air circulation between the first area and the second area is blocked. A wall is provided around the first area to partition it from other spaces in the house,
The wall is
A wall panel that extends from the floor slab to the ceiling slab,
The house according to claim 1, further comprising a sealing material disposed between a lower end of the wall panel and the floor slab and between an upper end of the wall panel and the ceiling slab. A second fitting that can be opened and closed is arranged between the second area and the third area,
3. The house according to claim 1, wherein the second fitting has a ventilation space that allows air to circulate. an exhaust fan that exhausts the first region;
The house according to any one of claims 1 to 3, wherein the exhaust fan that exhausts the second area is a common exhaust fan. The house according to any one of claims 1 to 4, wherein the only opening that enters and exits the first area is the first fitting. There is an external hallway adjacent to the residence,
The house according to any one of claims 1 to 5, wherein the exhaust duct that exhausts the first area extends to an outer wall beyond the exterior hallway. The house according to any one of claims 1 to 6, wherein air is supplied to the third area using at least an air supply fan.

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