KR20130044993A - Automatic movement fire prevention damper of building ventilation duct - Google Patents

Automatic movement fire prevention damper of building ventilation duct Download PDF

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Publication number
KR20130044993A
KR20130044993A KR1020110109398A KR20110109398A KR20130044993A KR 20130044993 A KR20130044993 A KR 20130044993A KR 1020110109398 A KR1020110109398 A KR 1020110109398A KR 20110109398 A KR20110109398 A KR 20110109398A KR 20130044993 A KR20130044993 A KR 20130044993A
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KR
South Korea
Prior art keywords
fire
exhaust pipe
damper
supply pipe
air supply
Prior art date
Application number
KR1020110109398A
Other languages
Korean (ko)
Inventor
오수창
김충환
오수원
Original Assignee
오수창
김충환
오수원
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 오수창, 김충환, 오수원 filed Critical 오수창
Priority to KR1020110109398A priority Critical patent/KR20130044993A/en
Publication of KR20130044993A publication Critical patent/KR20130044993A/en

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    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62C—FIRE-FIGHTING
    • A62C2/00—Fire prevention or containment
    • A62C2/06—Physical fire-barriers
    • A62C2/12—Hinged dampers
    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62C—FIRE-FIGHTING
    • A62C2/00—Fire prevention or containment
    • A62C2/06—Physical fire-barriers
    • A62C2/24—Operating or controlling mechanisms
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/08—Air-flow control members, e.g. louvres, grilles, flaps or guide plates
    • F24F13/10—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers

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  • Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Air-Flow Control Members (AREA)

Abstract

1. Technology Field
The present invention is an automatic fire damper that is installed between the exhaust pipe and the air supply pipe to the outside air to the outside of the room for building ventilation as the fire is generated in the room by the fire duct in the heat of a certain temperature by the fire duct It is related with the automatic fire damper of the building ventilation duct to block the movement of the fire to the surrounding room by simultaneously blocking the exhaust pipe and the exhaust pipe passage of the ventilation duct by dismantling the damper.
2. Main composition
The automatic fire damper of the building ventilation duct of the present invention includes: a damper body installed between an exhaust pipe through which indoor air flows out and an air supply pipe through which external air flows into the room; A supply exhaust pipe forming a connection exhaust pipe and a connection supply pipe having the same diameter so as to communicate with the exhaust pipe and the supply pipe in parallel with each other in the damper body; A fire prevention shielding plate formed to seal the exhaust pipe by a hinge shaft installed in the radial direction inside the connection exhaust pipe communicating with the exhaust pipe and the hinge shaft rotated; A fire prevention block formed to seal the air supply pipe by a movable movement along the outer circumference of the connection exhaust pipe to open and close the passage of the air supply pipe inside the damper body; A fire prevention shield is formed of a plurality of fire prevention shield and the fire prevention block is formed in a plurality of fire prevention fuses are formed so that the opening and closing is interrupted by the backflow flame.
3. Technology effect
According to the present invention, when a fire occurs in a room and heat is introduced into the ventilation duct for a predetermined temperature or more, the automatic fire damper is disassembled to simultaneously block the exhaust pipe and the air supply passage of the ventilation duct, thereby preventing the fire from moving to the surrounding room. It works.

Description

Automatic movement fire prevention damper of building ventilation duct

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic fire damper of a building ventilation duct. In particular, an automatic fire damper is installed between an exhaust pipe through which indoor air flows to the outside and an air supply pipe through which external air flows into the room for building ventilation. Therefore, the fire damper is dismantled when heat is introduced into the ventilation duct by discharging the fire damper, thereby automatically blocking the exhaust pipe and the exhaust pipe passage of the ventilation duct, thereby preventing fire from moving to the surrounding room.

In general, the ventilation system is installed inside the ceiling or wall of the building to serve to discharge the indoor air to the outside through the duct.

This ventilation system is equipped with a damper inside the duct to block the air flowing back from the outside.

On the other hand, as a prior art, Korean Patent Application No. 10-2008-0132763 (application date: December 24, 2008) discloses a "ventilator with a fire damper", it will be described with reference to FIG.

Ventilation openings equipped with a fire damper according to the prior art, A hinge installed in the radial direction of the circle in the intake port; A semicircular first blocking plate and a second blocking plate each side of which is rotatably installed at the hinge; A first fixing part and a second fixing part in which one side is in contact with the other side of the first blocking plate and the other side of the second blocking plate, respectively; And an elastic part installed at the central portion of the hinge and configured to apply a force to rotate the first blocking plate and the second blocking plate in an inlet direction, respectively, and the other sides of the first fixing part and the second fixing part are coupled to each other. When the temperature is above a certain temperature, the structure is melted and separated.

Accordingly, the conventional damper is a structure that seals only one ventilation hole, and the first blocking plate 131 and the second blocking plate 133 are unfolded on both sides by a rotation shaft formed at the center thereof, and thus the ventilation hole passage is blocked. One side of the first fixing part 510 is in contact with the other side of the blocking plate 131, and one side of the second fixing part 530 is in contact with the other side of the second blocking plate 133.

In this way, the conventional damper is used by installing a separate stopper in the inner side of the duct to open and close the first blocking plate 131 and the second blocking plate 133 in one direction, so that the catching jaw is smoothly separated when a fire occurs If not, the first blocking plate 131 and the second blocking plate 133 may not be able to seal the ventilation holes.

In addition, even when the first blocking plate 131 and the second blocking plate 133 are opened or closed, a space in which the first blocking plate 131 and the second blocking plate 133 may float may not be in close contact with the ventilation holes.

The present invention has been made in view of the above problems, the fire is generated in the interior as an automatic fire damper is installed between the exhaust pipe for the indoor air flows to the outside for building ventilation and the air supply pipe to the outside air flows into the room The purpose of the present invention is to provide an automatic fire damper in a building ventilation duct that blocks fire from moving to the surrounding room by simultaneously blocking the exhaust pipe and the exhaust pipe passage of the ventilation duct by dismantling the fire damper when heat is introduced into the ventilation duct. have.

The automatic fire damper of the building ventilation duct disclosed in the embodiment of the present invention, the damper body is installed between the exhaust pipe and the air supply pipe through which the indoor air flows to the outside; A supply exhaust pipe forming a connection exhaust pipe and a connection supply pipe having the same diameter so as to communicate with the exhaust pipe and the supply pipe in parallel with each other in the damper body; A fire prevention shielding plate formed to seal the exhaust pipe by a hinge shaft installed in the radial direction inside the connection exhaust pipe communicating with the exhaust pipe and the hinge shaft rotated; A fire prevention block formed to seal the air supply pipe by a movable movement along the outer circumference of the connection exhaust pipe to open and close the passage of the air supply pipe inside the damper body; A plurality of fire prevention shields and fire prevention blocks are formed on one side, and are formed to be opened and closed by a flame that has flowed back.

Preferably, the supply and exhaust pipe, the connecting exhaust pipe and the connecting supply pipe communicating with both the exhaust pipe and the supply pipe is integrally formed.

Preferably, the fire protection shield further includes maintaining a parallel state by the fire protection fuse in a state in which ventilation is made, and sealing the exhaust pipe by a short circuit of the fire protection fuse.

Preferably, the fire prevention block portion, the blocking plate to move along the outer periphery of the connection exhaust pipe in a short circuit of the fire protection fuse to seal the air supply pipe; A pressure plate formed in the longitudinal direction on the outer periphery of the connection exhaust pipe and having a compression spring elastically installed therein; A guide mechanism for guiding sliding of the blocking plate forward by the expansion of the compression spring; A plurality of wire hooks provided on a rear surface of the blocking plate; And wires respectively connected to the wire hangers.

Preferably, the wire is to seal the air supply pipe to the blocking plate, and further comprises separating the blocking plate from the air supply pipe by pulling the wire.

Preferably, the fire protection fuse, the fire protection shield and the fire protection block to maintain a fixed state coupled on each side, and if more than a certain temperature, further comprises melting and short-circuit at the same time.

According to the present invention, if a fire occurs in a room and heat is introduced into the ventilation duct for a predetermined temperature or more, the automatic fire damper is disassembled to simultaneously block the exhaust pipe and the air supply passage of the ventilation duct, thereby preventing the fire from moving to the surrounding room. It works.

The automatic fire damper of the building ventilation duct of the present invention is capable of effectively exhausting the exhaust air by blocking the inflow of external air flowing back from the supply pipe together with the function of blocking the exhaust pipe when a fire occurs.

1 is a cross-sectional view showing a ventilation opening provided with a conventional fire damper.
2 is a perspective view showing the whole of the automatic fire damper according to the present invention.
Figure 3 is a perspective view showing the interior of the automatic fire damper according to the present invention.
Figure 4 is a side view for showing a fire shield in accordance with the present invention.
5 schematically shows the operation of a fire shielding plate according to the present invention;
Figure 6 is a state diagram before operation of the fire protection block according to the present invention.
Figure 7 is a state diagram after the operation of the fire protection block according to the present invention.
(A) is a top view of a fire prevention block, (B) is a side view of a fire prevention block.
9 is a view showing the opening and the wire of the damper body according to the present invention.

According to an aspect of the present invention,

A damper body installed between an exhaust pipe through which indoor air is leaked to the outside and an air supply pipe through which external air is introduced into the room;

A supply exhaust pipe forming a connection exhaust pipe and a connection supply pipe having the same diameter so as to communicate with the exhaust pipe and the supply pipe in parallel with each other in the damper body;

A fire prevention shielding plate formed to seal the exhaust pipe by a hinge shaft installed in the radial direction inside the connection exhaust pipe communicating with the exhaust pipe and the hinge shaft rotated;

A fire prevention block formed to seal the air supply pipe by a movable movement along the outer circumference of the connection exhaust pipe to open and close the passage of the air supply pipe inside the damper body;

It has been achieved by providing an automatic fire damper of the building ventilation duct, characterized in that it comprises a fire protection fuse formed on the one side of each of the fire shielding shield and the fire blocking block to be opened and closed by the reversed flame.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Prior to this, terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms, and the inventor should appropriately interpret the concepts of the terms appropriately It should be interpreted in accordance with the meaning and concept consistent with the technical idea of the present invention based on the principle that it can be defined.

Therefore, the embodiments described in the present specification and the configurations shown in the drawings are only the most preferred embodiments of the present invention, and not all of the technical ideas of the present invention are described. Therefore, It should be understood that various equivalents and modifications are possible.

The automatic fire damper of the building ventilation duct of the present invention is an automatic fire damper mounted between an exhaust pipe 10 through which indoor air flows to the outside and an air supply pipe 20 through which external air flows into the room for building ventilation. When the heat is introduced into the ventilation duct more than a predetermined temperature is the fire damper is dismantled to block the passage of the exhaust pipe 10 and the air supply pipe 20 of the ventilation duct at the same time to block the fire from moving to the surrounding room.

2 to 3, the automatic fire damper of the building ventilation duct of the present invention is largely damper body 110, supply and exhaust pipe 120, fire protection shield 130, fire protection block 140, fire protection fuse ( 150).

First, the damper body 110 is installed between the duct and the duct for building ventilation is connected so that the exhaust pipe 10 through which the indoor air flows to the outside and the air supply pipe 20 through which the indoor air flows into the room is made. It is installed to block the exhaust pipe 10 and the air supply pipe 20 during the fire.

The damper body 110 is provided with a supply pipe 120 having the same diameter so as to communicate in parallel with the exhaust pipe 10 and the supply pipe 20, respectively, the supply pipe 120 is connected to the exhaust pipe ( 122 and a connecting air supply pipe 124 are formed, respectively.

The supply and exhaust pipe 120 is configured to integrally connect the exhaust pipe 10 and the supply pipe 20 and the connection exhaust pipe 122 and the connection air supply pipe 124 in the damper body 110.

Meanwhile, a rotatable fire shielding plate 130 is installed inside the connection exhaust pipe 122 communicating with the exhaust pipe 10, and the fire prevention shielding plate 130 has a hinge shaft 132 in a radial direction in a circular internal space. While being fixed by, is formed to seal the exhaust pipe 10 by the rotation of the hinge shaft 132.

As shown in FIGS. 4 and 5, the fire protection shield 130 is rotatably mounted to the connection exhaust pipe 122 about the hinge shaft 132, and thus, the fluid passing through the exhaust pipe 10 is normally used. The internal air is vented to the outside so that the passage is level and unobstructed.

At this time, the fire protection shield 130 is fixed by the fire protection fuse 150 on one side to maintain a horizontal.

That is, one side of the fire protection fuse 150 is fixed to the inner wall of the exhaust pipe 10, the other side is fixed to the fire protection shield 130, the fire shield shield 130 maintains a horizontal state.

If a fire occurs, if the temperature exceeds a specific temperature due to the flame flowing back to the exhaust pipe 10, the fire protection fuse 150 is shorted by recording the fire protection shield 130 and the fire protection fuse 150 at the same time as the recording. 130 rotates about the hinge shaft 132 to seal the exhaust pipe 10.

In this case, the fire protection shield 130 is rotated about the hinge shaft 132, but the projection around the inner side of the connection exhaust pipe 122, the fire protection shield 130 is rotated to prevent any further rotation in a vertically closed state 134 is formed.

Here, the fire protection fuse 150 used in the fire protection shield 130 and the fire protection block 140 is a material such as lead that can be melted at a high temperature, and melts when it is at least 72 degrees.

In the present invention, the fire fuse 150 will be melted when it is 72 degrees or more, but can be changed to be melted at a temperature (set temperature of 65 ° C, 67 ° C, 72 ° C, etc.) prescribed by the fire method.

In addition, the fire protection shield 130 is maintained in a parallel state by the fire protection fuse 150 in a state that the ventilation is made, it is to seal the exhaust pipe 10 by a short circuit of the fire protection fuse (150).

In addition, as shown in Figures 6 to 8, the movable fire protection block that slides along the outer periphery of the connecting exhaust pipe 122 to open and close the passage of the air supply pipe 20 in the damper body 110 ( 140 is made, it is formed to seal the air supply pipe (20).

The fire protection block 140 is configured with a blocking plate 142 for sealing the air supply pipe 20.

The blocking plate 142 has a circular band shape in which a through hole is formed to be movable along the outer circumference of the connection exhaust pipe 122, and forms a circular protrusion piece forming a predetermined protrusion from the center through hole to the rear side. 122) improves movement at the outer periphery;

The blocking plate 142 moves along the outer circumference of the connection exhaust pipe 122 by a short circuit of the fire protection fuse 150 to seal the air supply pipe 20.

A plurality of pressure plates 144 having a compression spring 143 for allowing the blocking plate 142 to be advanced along the connection exhaust pipe 122 are installed in the longitudinal direction on the outer circumference of the connection exhaust pipe 122.

In addition, the pressure plate 144 is coupled to the guide sphere 146 to pressurize the compression spring 143 while the compression spring 143 is built, the guide sphere 146 is connected to the blocking plate 142. .

The guide mechanism 146 guides the blocking plate 142 to slide forward by the expansion of the compression spring 143.

The guide tool 146 is slid forward and backward, the pressing plate 144 is fixed to the outer periphery of the connecting exhaust pipe (122).

That is, the blocking plate 142 is inserted into the pressure plate 144 so that the guide hole 146 connected to the blocking plate 142 at a predetermined distance from the air supply pipe 20 compresses the compression spring 143. In order to prevent the blocking plate 142 from moving forward, the blocking plate 142 is fixed by the fire fuse 150.

Then, when the fire occurs, the guide sphere 146 is pushed by the expansion of the compression spring 143 in the short circuit of the fire protection fuse 150, the guide sphere 146 to push the blocking plate 142 toward the air supply pipe 20 to seal. To guide.

The fire prevention block 142 maintains a state spaced apart from the air supply pipe 20 at normal times so that the air supply pipe 20 is vented, and the fire protection block 140 is located at a predetermined distance from the air supply pipe 20. It is fixed.

On the other hand, the fire protection block 140 is fixed by the fire fuse 150, the fire fuse 150 is one side is fixed to the inner wall of the damper body 110, the other side is connected to the fire protection block 140. do.

At this time, the fire protection fuse 150 is connected to the circumference of the fire protection block 140.

In addition, the fire protection block 140 is fixed by the fire protection fuse 150 in a state that the ventilation is made to maintain a spaced apart from the air supply pipe 20, if a fire occurs, the damper body 110 inside When the flame is reversed to a specific temperature or more, the fire protection fuse 150 is recording and at the same time, the blocking plate 142 and the fire protection fuse 150 of the fire protection block 140 are short-circuited and the blocking plate 142 is connected to the exhaust pipe. It slides forward along the outer periphery of 122 to seal the air supply pipe 20.

Meanwhile, as shown in FIG. 9, a plurality of wire hooks 148 are provided on the rear surface of the blocking plate 142, and wires 149 are connected to the wire hooks 148, respectively.

The wire 149 is on the outer side of the connection air supply 122.

The wire 149 is a blocking plate 142 to close the air supply pipe 20 by a fire, and then when the re-installation of the fire prevention block 140, the blocking plate 142 by pulling the rear side of the wire 149. May be spaced apart from the air supply pipe 20, and the fire protection block 140 may be reinstalled by re-installing the fire protection fuse 150 on the blocking plate 142.

At this time, the wire 149 on the side of the air supply pipe 20 by the opening of the opening portion 160 is configured by forming an open portion 160 to visually check the connection air supply pipe 124 from the outside of the damper body 110. Can pull.

In addition, the fire protection shield 130 may also be rotated around the hinge shaft 132 to re-install the fire protection fuse 150 to be reused.

That is, the fire protection shield 130 and fire protection block 140 is to facilitate the closure quickly and accurately, with a more smooth restoring force for reuse.

The automatic fire damper of the building ventilation duct of the present invention blocks the air supply pipe 20 and the exhaust pipe 10 by the fire shielding plate 130 and the fire protection block 140 at the same time so that the heat or toxic gas generated in the room is exhaust pipe. By blocking the flow into the other room through (10) it can prevent the secondary damage caused by the fire.

The automatic fire damper of the building ventilation duct of the present invention configured as described above effectively blocks the inflow of the external air flowing back from the air supply pipe 20 together with the function of blocking the exhaust pipe 10 in the event of a fire to effectively exhaust the exhaust air exhausted. It can be.

Although described and illustrated with respect to some embodiments for illustrating the technical idea of the present invention, the present invention is not limited to the configuration and operation as described and described as such, and deviate from the scope of the technical idea It will be appreciated by those skilled in the art that many modifications and variations can be made to the present invention without departing from the scope of the invention. And all such modifications and changes as fall within the scope of the present invention are therefore to be regarded as being within the scope of the present invention.

10: baggage building 20: grade institution
110: damper body 120: supply and exhaust pipe
122: connection exhaust pipe 124: connection supply pipe
130: fire protection shield 132: hinge shaft
134: locking projection 140: fire prevention block
142: blocking plate 143: compression spring
144: pressure plate 146: guide sphere
148: wire hanger 149: wire
150: fire protection fuse 160: open

Claims (6)

A damper body installed between an exhaust pipe through which indoor air is leaked to the outside and an air supply pipe through which external air is introduced into the room;
A supply exhaust pipe forming a connection exhaust pipe and a connection supply pipe having the same diameter so as to communicate with the exhaust pipe and the supply pipe in parallel with each other in the damper body;
A fire prevention shielding plate formed to seal the exhaust pipe by a hinge shaft installed in the radial direction inside the connection exhaust pipe communicating with the exhaust pipe and the hinge shaft rotated;
A fire prevention block formed to seal the air supply pipe by a movable movement along the outer circumference of the connection exhaust pipe to open and close the passage of the air supply pipe inside the damper body;
A fire prevention damper of a building ventilation duct, comprising a fire protection fuse formed on the one side of each of the fire protection shield and the fire prevention block so as to be opened and closed by the reversed flame.
The method of claim 1,
The supply and exhaust pipe,
An automatic fire damper for a building ventilation duct, comprising a connecting exhaust pipe and a connecting air supply pipe communicating with both the exhaust pipe and the air supply pipe.
The method of claim 1,
The fire protection shield,
An automatic fire damper of a building ventilation duct further comprising sealing the exhaust pipe with a short circuit of the fire fuse while maintaining a parallel state by the fire fuse in a state of ventilation.
The method of claim 1,
The fire prevention block,
Blocking plate for closing the supply pipe by moving along the outer periphery of the connecting exhaust pipe by a short circuit of the fire protection fuse;
A pressure plate formed in the longitudinal direction on the outer periphery of the connection exhaust pipe and having a compression spring elastically installed therein;
A guide mechanism for guiding sliding of the blocking plate forward by the expansion of the compression spring;
A plurality of wire hooks provided on a rear surface of the blocking plate; And
Automatic fire damper of the building ventilation duct comprising a wire connected to each of the wire hanger.
5. The method of claim 4,
The wire,
The blocking plate to seal the air supply pipe,
An automatic fire damper of the building ventilation duct further comprising separating the barrier plate from the air supply pipe by pulling the wire.
The method of claim 1,
The fire protection fuse,
An automatic fire damper of a building ventilation duct further comprising a fixed state coupled to one side of each of the fire shielding plate and the fire blocking unit, and melting and short-circuiting at a certain temperature.
KR1020110109398A 2011-10-25 2011-10-25 Automatic movement fire prevention damper of building ventilation duct KR20130044993A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020110109398A KR20130044993A (en) 2011-10-25 2011-10-25 Automatic movement fire prevention damper of building ventilation duct

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Application Number Priority Date Filing Date Title
KR1020110109398A KR20130044993A (en) 2011-10-25 2011-10-25 Automatic movement fire prevention damper of building ventilation duct

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR200477663Y1 (en) * 2014-05-27 2015-07-07 (주)폴리텍 Fire damper
US10401040B2 (en) 2017-03-21 2019-09-03 Samsung Electronics Co., Ltd. Air conditioner
US11557635B2 (en) 2019-12-10 2023-01-17 Samsung Display Co., Ltd. Display device, mask assembly, and apparatus for manufacturing the display device
US11605675B2 (en) 2019-03-04 2023-03-14 Samsung Display Co., Ltd. Display device, mask assembly, and apparatus and method of manufacturing the display device
US11949298B2 (en) 2020-11-04 2024-04-02 Kohler Co. Generator enclosure with fire damper
US12035598B2 (en) 2019-03-04 2024-07-09 Samsung Display Co., Ltd. Display device, mask assembly, and apparatus and method of manufacturing the display device

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR200477663Y1 (en) * 2014-05-27 2015-07-07 (주)폴리텍 Fire damper
US10401040B2 (en) 2017-03-21 2019-09-03 Samsung Electronics Co., Ltd. Air conditioner
US11605675B2 (en) 2019-03-04 2023-03-14 Samsung Display Co., Ltd. Display device, mask assembly, and apparatus and method of manufacturing the display device
US11621302B2 (en) 2019-03-04 2023-04-04 Samsung Display Co., Ltd. Display device, mask assembly, and apparatus and method of manufacturing the display device
US12035598B2 (en) 2019-03-04 2024-07-09 Samsung Display Co., Ltd. Display device, mask assembly, and apparatus and method of manufacturing the display device
US11557635B2 (en) 2019-12-10 2023-01-17 Samsung Display Co., Ltd. Display device, mask assembly, and apparatus for manufacturing the display device
US11949298B2 (en) 2020-11-04 2024-04-02 Kohler Co. Generator enclosure with fire damper

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