JP2021041209A - Gas fire extinguishing equipment and construction method for the same - Google Patents

Gas fire extinguishing equipment and construction method for the same Download PDF

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JP2021041209A
JP2021041209A JP2020195089A JP2020195089A JP2021041209A JP 2021041209 A JP2021041209 A JP 2021041209A JP 2020195089 A JP2020195089 A JP 2020195089A JP 2020195089 A JP2020195089 A JP 2020195089A JP 2021041209 A JP2021041209 A JP 2021041209A
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fire extinguishing
gas
duct
extinguishing agent
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秀晃 後藤
Hideaki Goto
秀晃 後藤
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Air Water Safety Service Inc
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Abstract

To provide gas fire extinguishing equipment capable of achieving a reduction in construction cost and an increase in the degree of freedom of design.SOLUTION: Gas fire extinguishing equipment comprises a duct 2 for discharging fire extinguisher gas from a protected section 1 into which the fire extinguisher gas is introduced, and a volume increasing part 14 that is provided in the duct 2 and that serves as means for increasing a flow volume of the fire extinguisher gas within the duct 2. The volume increasing part 14 includes increasing at least either of the flow rate and density of the fire extinguisher gas. In addition, the volume increasing part 14 is provided within the duct 2 or outside the duct 2.SELECTED DRAWING: Figure 1

Description

この発明はガス系消火設備に関するものである。 The present invention relates to gas-based fire extinguishing equipment.

従来、ガス系消火設備は、たとえば特開２０１４−１０８１８５号公報（特許文献１）に開示されている。 Conventionally, gas-based fire extinguishing equipment is disclosed in, for example, Japanese Patent Application Laid-Open No. 2014-108185 (Patent Document 1).

特開２０１４−１０８１８５号公報Japanese Unexamined Patent Publication No. 2014-108185

従来のガス系消火設備では施工コストが高く、かつ、設計の自由度が低いという問題があった。そこで、この発明は上記の問題点を解決するためになされたものであり、施工コストを低下させることが可能で、かつ、設計の自由度が高いガス系消火設備を提供することを目的とするものである。 The conventional gas-based fire extinguishing equipment has a problem that the construction cost is high and the degree of freedom in design is low. Therefore, the present invention has been made to solve the above problems, and an object of the present invention is to provide a gas-based fire extinguishing system capable of reducing the construction cost and having a high degree of freedom in design. It is a thing.

この発明に従ったガス系消火設備は、消火剤ガスが導入される防護区画から消火剤ガスを排出するためのダクトと、ダクトに設けられてダクト内の消火ガスの流量を増加させる手段とを備える。 The gas-based fire extinguishing equipment according to the present invention includes a duct for discharging the fire extinguishing agent gas from the protective zone into which the fire extinguishing agent gas is introduced, and a means provided in the duct to increase the flow rate of the fire extinguishing gas in the duct. Be prepared.

好ましくは、消火剤ガスの流量を増加させる手段は、消火剤ガスの流速および密度の少なくともいずれかを増加させることを含む。 Preferably, the means of increasing the flow rate of the extinguishing agent gas comprises increasing at least one of the flow rates and densities of the extinguishing agent gas.

好ましくは、消火剤ガスの流量を増加させる手段は、ダクト内に設けられる。
好ましくは、消火剤ガスの流量を増加させる手段は、ダクト外に設けられる。 Preferably, a means for increasing the flow rate of the fire extinguishing agent gas is provided in the duct.
Preferably, the means for increasing the flow rate of the fire extinguishing agent gas is provided outside the duct.

好ましくは、消火剤ガスの流量を増加させる手段は、ファンにより消火剤ガスの流速を増加させる。 Preferably, the means for increasing the flow rate of the extinguishing agent gas is to increase the flow rate of the extinguishing agent gas by a fan.

好ましくは、消火剤ガスの流量を増加させる手段は、消火剤ガスを冷却することにより消火剤ガスの密度を増加させる。 Preferably, the means for increasing the flow rate of the extinguishing agent gas increases the density of the extinguishing agent gas by cooling the extinguishing agent gas.

この発明の別の局面に従ったガス系消火設備は、消火剤ガスが導入される防護区画から消火剤ガスを排出するためのダクトを備え、ダクトは防護区画が設けられる建物を縦方向に貫通する孔に接続される。 The gas-based fire extinguishing equipment according to another aspect of the present invention includes a duct for discharging the fire extinguishing agent gas from the protective zone into which the fire extinguishing agent gas is introduced, and the duct penetrates the building in which the protective zone is provided in the vertical direction. It is connected to the hole to be fired.

実施の形態１に従ったガス消火設備の模式図である。It is a schematic diagram of the gas fire extinguishing equipment according to Embodiment 1. 図１中のＩＩ−ＩＩ線に沿った断面図である。It is sectional drawing along the line II-II in FIG. ダクトを拡大して示す模式図である。It is a schematic diagram which shows the duct enlarged. 実施の形態２に従ったガス消火設備の模式図である。It is a schematic diagram of the gas fire extinguishing equipment according to the second embodiment. 実施の形態３に従ったガス消火設備の模式図である。It is a schematic diagram of the gas fire extinguishing equipment according to the third embodiment. 実施の形態４に従ったガス消火設備の模式図である。It is a schematic diagram of the gas fire extinguishing equipment according to Embodiment 4.

以下、この発明の実施の形態について、図面を参照して説明する。以下の実施の形態では同一または相当する部分については同一の参照符号を付し、その説明については繰り返さない。また、各実施の形態を組み合わせることも可能である。 Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following embodiments, the same or corresponding parts are designated by the same reference numerals, and the description thereof will not be repeated. It is also possible to combine each embodiment.

（実施の形態１）
本発明者は、従来の問題点、すなわち、ガス系消火設備において施工コストが高く、設計の自由度が低いという問題について分析した。その結果、ガス系消火設備のコストおよび設計の自由度に関して、ダクトのコストが高く、設計の自由度を狭めているという問題を見出した。 (Embodiment 1)
The present inventor has analyzed the conventional problems, that is, the problems that the construction cost is high and the degree of freedom of design is low in the gas-based fire extinguishing equipment. As a result, regarding the cost of gas-based fire extinguishing equipment and the degree of freedom in design, it was found that the cost of the duct is high and the degree of freedom in design is narrowed.

従来のダクトは、消火剤ガスが導入される防護区域からその防護区域を有する建物の外まで延びている。仮にダクトが従来よりも細くなれば、ダクトに関連する施工コストを低下させることができる。 The conventional duct extends from the protected area where the fire extinguishing gas is introduced to the outside of the building having the protected area. If the duct is thinner than before, the construction cost related to the duct can be reduced.

さらにダクトは建物内で縦および／または横方向に延びるため、建物の構造にも影響を与える。仮に、ダクトが従来よりも細くなれば従来はダクトを配管することができなかった狭い場所にもダクトを配管することができ、設計の自由度が高まる。 In addition, ducts extend vertically and / or horizontally within the building, which also affects the structure of the building. If the duct is thinner than before, the duct can be piped even in a narrow place where the duct could not be piped in the past, and the degree of freedom in design is increased.

図１から３を参照して、ガス消火設備は、防護区画１内へ消火剤ガスを送る配管３と、防護区画１に接続されて消火剤ガスを排出するためのダクト２とを備える。 With reference to FIGS. 1 to 3, the gas fire extinguishing equipment includes a pipe 3 for sending the fire extinguishing agent gas into the protected area 1 and a duct 2 connected to the protected area 1 for discharging the extinguishing agent gas.

防護区画１は、ビルなどの建物に設けられる部屋である。電子機器が設けられている部屋では、消火のために水を用いることができず、消火剤ガスを用いて消火を行う。噴射ノズル４から消火ガス剤を防護区画１に放出して、不活性の消火剤ガスを防護区画１に充満させて酸素濃度を減少させることで消火することが可能である。消火剤ガスとしては、窒素、アルゴンなどの不活性ガスおよびハロゲン系のガスが用いられる。 The protected area 1 is a room provided in a building such as a building. In rooms where electronic devices are installed, water cannot be used to extinguish a fire, and a fire extinguishing agent gas is used to extinguish the fire. The fire can be extinguished by discharging the fire extinguishing gas agent from the injection nozzle 4 to the protective compartment 1 and filling the protective compartment 1 with the inert fire extinguishing agent gas to reduce the oxygen concentration. As the fire extinguishing agent gas, an inert gas such as nitrogen or argon or a halogen-based gas is used.

ダクト２は、防護区画１の消火剤ガスを防護区画１から放出するためのガス経路である。ダクト２は、中空であり角型および丸型のいずれであってもよい。防護区画１の避圧口１ａでダクト２の端部には、ダンパ１２が設けられており、ダンパ１２が開閉することでダクト２と防護区画１とが連通および遮断される。ダンパ１２は実線で記載されている位置から点線で記載されている位置まで回動可能である。この実施の形態では防護区画１に一本のダクト２のみが設けられているが、複数本のダクト２が設けられていてもよい。 The duct 2 is a gas path for discharging the fire extinguishing agent gas of the protected compartment 1 from the protected compartment 1. The duct 2 is hollow and may be square or round. A damper 12 is provided at the end of the duct 2 at the pressure relief port 1a of the protection compartment 1, and the duct 2 and the protection compartment 1 are communicated with each other and cut off by opening and closing the damper 12. The damper 12 can rotate from the position described by the solid line to the position described by the dotted line. In this embodiment, only one duct 2 is provided in the protection zone 1, but a plurality of ducts 2 may be provided.

ダクト２にはダクト内の消火剤ガスの流量を増加させるための増量部１４が設けられている。この実施の形態では、ダクト２の出口１３に増量部１４が設けられているが、ダクト２の入口（避圧口１ａ）と出口１３との間に増量部１４が設けられていてもよい。 The duct 2 is provided with an increasing portion 14 for increasing the flow rate of the fire extinguishing agent gas in the duct. In this embodiment, the increase portion 14 is provided at the outlet 13 of the duct 2, but the increase portion 14 may be provided between the inlet (pressure relief port 1a) of the duct 2 and the outlet 13.

増量部１４は消火剤ガスの流速を増加させるために、たとえばファンによりダクト２内のガスをダクト２外へ排出する機能を有する。増量部１４は負圧を発生させ、避圧口１ａと出口１３との間の圧力勾配を大きくすることで、ダクト２内のガスの流速を増加させることが可能となる。 The increase unit 14 has a function of discharging the gas in the duct 2 to the outside of the duct 2 by, for example, a fan in order to increase the flow velocity of the fire extinguishing agent gas. The increase unit 14 generates a negative pressure and increases the pressure gradient between the pressure relief port 1a and the outlet 13, so that the flow velocity of the gas in the duct 2 can be increased.

増量部１４を駆動させるための動力として、たとえば非常用の電源を用いることができる。増量部１４が可動するのは火災時であり、通常の電源を使うことができない可能性がある。そのため、非常用の電源で、通常の電源とは別系統のものを用いることが好ましい。増量部１４はダクト２内に設けられていてもよく、ダクト２外に設けられていてもよい。 As the power for driving the increase unit 14, for example, an emergency power source can be used. The increase unit 14 can move in the event of a fire, and there is a possibility that a normal power source cannot be used. Therefore, it is preferable to use an emergency power supply that is different from the normal power supply. The increase portion 14 may be provided inside the duct 2 or may be provided outside the duct 2.

配管３は、防護区画１外に配置されているガス貯蔵容器５から防護区画１へ消火剤ガスを送るための経路である。配管３にはオリフィス６が設けられており、オリフィス６を通過した消火剤ガスが噴射ノズル４を経由して防護区画１へ放出される。 The pipe 3 is a route for sending the fire extinguishing agent gas from the gas storage container 5 arranged outside the protection compartment 1 to the protection compartment 1. The pipe 3 is provided with an orifice 6, and the fire extinguishing agent gas that has passed through the orifice 6 is discharged to the protection section 1 via the injection nozzle 4.

すなわちガス系消火設備は、消火剤ガスが導入される防護区画１から消火剤ガスを排出するためのダクト２と、ダクト２に設けられてダクト２内の消火剤ガスの流量を増加させる手段としての増量部１４とを備える。増量部１４は、消火剤ガスの流速および密度の少なくともいずれかを増加させることを含む。 That is, the gas-based fire extinguishing equipment is provided as a duct 2 for discharging the fire extinguishing agent gas from the protection section 1 into which the fire extinguishing agent gas is introduced and as a means for increasing the flow rate of the fire extinguishing agent gas in the duct 2 provided in the duct 2. It is provided with an increase unit 14 of the above. The weight increasing section 14 includes increasing at least one of the flow rate and density of the fire extinguishing agent gas.

以上のように構成されたガス系消火設備では、増量部１４により消火剤ガスの流速を増加させることができるため、増量部１４が設けられていない場合と比較して、ダクト２の断面積を小さくしても十分なダクト内の消火剤ガスの流量を確保することができる。その結果、ダクト２を小型化することができ、施工費用を低下させることが可能となる。 In the gas-based fire extinguishing equipment configured as described above, since the flow velocity of the fire extinguishing agent gas can be increased by the increasing portion 14, the cross-sectional area of the duct 2 is larger than that in the case where the increasing portion 14 is not provided. Even if it is made small, it is possible to secure a sufficient flow rate of the fire extinguishing agent gas in the duct. As a result, the duct 2 can be miniaturized, and the construction cost can be reduced.

さらに、ダクト２が小型化することにより、従来はダクト２を配管できなかった狭い場所にダクト２を配管することができる。その結果設計の自由とが高まる。さらに、防護区画１が設けられる建物のデッドスペースにダクト２を配管することができる。 Further, as the duct 2 is miniaturized, the duct 2 can be piped in a narrow place where the duct 2 could not be piped in the past. As a result, design freedom is increased. Further, the duct 2 can be piped to the dead space of the building where the protection section 1 is provided.

（実施の形態２）
図４を参照して、実施の形態２に従ったガス系消火設備では、ダクト２を冷却するための冷却部１５が設けられている。ダクト２内の消火剤ガスの密度は温度に関連し、温度が低くなれば密度は大きくなる。そのため、冷却部１５でダクト２を冷却することでダクト２内の消火剤ガスの密度を大きくし、ダクト２内の消火剤ガスの流量を増加させることが可能となる。 (Embodiment 2)
With reference to FIG. 4, in the gas-based fire extinguishing system according to the second embodiment, a cooling unit 15 for cooling the duct 2 is provided. The density of the fire extinguishing agent gas in the duct 2 is related to the temperature, and the lower the temperature, the higher the density. Therefore, by cooling the duct 2 with the cooling unit 15, the density of the fire extinguishing agent gas in the duct 2 can be increased, and the flow rate of the fire extinguishing agent gas in the duct 2 can be increased.

冷却部１５はダクト２を冷却するものであり、たとえば防護区画１の空調のために用いられる冷媒配管で構成される。空調が冷房の場合にはキャピラリを経由して温度が低下した冷媒を冷却部１５に導き、ダクト２の温度を低下させることができる。空調が暖房の場合には、室内に熱を提供した後のエンタルピの低い低温の冷媒を冷却部１５に導き、ダクト２の温度を低下させることができる。 The cooling unit 15 cools the duct 2, and is composed of, for example, a refrigerant pipe used for air conditioning of the protection section 1. When the air conditioner is cooling, the refrigerant whose temperature has decreased can be guided to the cooling unit 15 via the capillary, and the temperature of the duct 2 can be decreased. When the air conditioner is heating, a low-temperature refrigerant having a low enthalpy after providing heat to the room can be guided to the cooling unit 15 to lower the temperature of the duct 2.

この実施の形態では、ダクト２の全長にわたって冷却部１５が設けられているが、少なくとも一部分に冷却部１５が設けられていればよい。さらに、ダクト２の全周にわたって冷却部１５が設けられているが、少なくとも一部分に冷却部１５が設けられていればよい。 In this embodiment, the cooling unit 15 is provided over the entire length of the duct 2, but it is sufficient that the cooling unit 15 is provided at least in a part thereof. Further, although the cooling unit 15 is provided over the entire circumference of the duct 2, it is sufficient that the cooling unit 15 is provided at least partially.

このように構成されたガス系消火設備では、実施の形態１に従ったガス系消火設備と同じ効果がある。 The gas-based fire extinguishing system configured in this way has the same effect as the gas-based fire extinguishing system according to the first embodiment.

（実施の形態３）
図５を参照して、実施の形態３に従ったガス系消火設備では、配管３の一部を分岐させて分岐管２３とし、その分岐管２３をダクト３内に導いている。分岐管２３の消火剤ガスは、ダクト２内の出口１３付近で出口１３に向かって放出される。これにより、出口１３付近が負圧となる。避圧口１ａと出口１３との間の圧力勾配を大きくすることで、ダクト２内のガスの流速を増加させることが可能となる。 (Embodiment 3)
In the gas-based fire extinguishing system according to the third embodiment with reference to FIG. 5, a part of the pipe 3 is branched to form a branch pipe 23, and the branch pipe 23 is guided into the duct 3. The fire extinguishing agent gas of the branch pipe 23 is discharged toward the outlet 13 near the outlet 13 in the duct 2. As a result, the vicinity of the outlet 13 becomes a negative pressure. By increasing the pressure gradient between the pressure relief port 1a and the outlet 13, the flow velocity of the gas in the duct 2 can be increased.

（実施の形態４）
図６を参照して、実施の形態４に従ったガス系消火設備では、建築躯体の孔３０（シャフト）にダクト２を接続する。 (Embodiment 4)
With reference to FIG. 6, in the gas-based fire extinguishing system according to the fourth embodiment, the duct 2 is connected to the hole 30 (shaft) of the building frame.

実施の形態１から３では、ダクト２内の消火剤ガスの流量を増加させることでダクトを小型化した。しかしながら、実施の形態４では、ダクト２の出口１３を建物の外へ導くのではなく、建物内の孔３０の接続することでダクト２の全長を短縮している。これにより施工コストを低減し、かつ、設計の自由度を高めている。 In the first to third embodiments, the duct is miniaturized by increasing the flow rate of the fire extinguishing agent gas in the duct 2. However, in the fourth embodiment, the total length of the duct 2 is shortened by connecting the holes 30 in the building instead of guiding the outlet 13 of the duct 2 to the outside of the building. This reduces the construction cost and increases the degree of freedom in design.

すなわち、系消火設備は、消火剤ガスが導入される防護区画１から消火剤ガスを排出するためのダクト２を備え、ダクト２は防護区画１が設けられる建物を縦方向に貫通する孔３０に接続される。 That is, the system fire extinguishing equipment includes a duct 2 for discharging the fire extinguishing agent gas from the protective section 1 into which the fire extinguishing agent gas is introduced, and the duct 2 is formed in a hole 30 that vertically penetrates the building in which the protective section 1 is provided. Be connected.

以上、この発明の実施の形態について説明したが、ここで示した実施の形態はさまざまに変形することが可能である。まず、各実施の形態を組み合わせることが可能である。特に実施の形態１から３は容易に組み合わせることが可能である。 Although the embodiments of the present invention have been described above, the embodiments shown here can be variously modified. First, it is possible to combine each embodiment. In particular, embodiments 1 to 3 can be easily combined.

さらに、実施の形態１から３と、実施の形態４との組み合わせに関しては、防護区画１の一部分の消火剤ガスを実施の形態１から３のダクト２で排気し、残りの部分を実施の形態４のダクト２で排気することが可能である。 Further, regarding the combination of the first to third embodiments and the fourth embodiment, a part of the fire extinguishing agent gas of the protected compartment 1 is exhausted through the duct 2 of the first to third embodiments, and the remaining portion is exhausted from the duct 2 of the first embodiment. It is possible to exhaust air through the duct 2 of 4.

今回開示された実施の形態はすべての点で例示であって制限的なものではないと考えられるべきである。本発明の範囲は上記した説明ではなくて特許請求の範囲によって示され、特許請求の範囲と均等の意味および範囲内でのすべての変更が含まれることが意図される。 It should be considered that the embodiments disclosed this time are exemplary in all respects and not restrictive. The scope of the present invention is shown by the scope of claims rather than the above description, and it is intended to include all modifications within the meaning and scope equivalent to the scope of claims.

この発明は、ガス系消火設備の分野において利用することができる。 The present invention can be used in the field of gas-based fire extinguishing equipment.

１ 防護区画、１ａ 避圧口、２ ダクト、３ 配管、４ 噴射ノズル、５ ガス貯蔵容器、６ オリフィス、１２ ダンパ、１３ 出口、１４ 増量部、１５ 冷却部、２３
分岐管、３０ 孔。 1 Protective compartment, 1a pressure shield, 2 duct, 3 piping, 4 injection nozzle, 5 gas storage container, 6 orifice, 12 damper, 13 outlet, 14 increase part, 15 cooling part, 23
Branch pipe, 30 holes.

Claims (7)

消火剤ガスが導入される防護区画から消火剤ガスを排出するためのダクトと、
前記ダクトに設けられて前記ダクト内の消火剤ガスの流量を増加させる手段とを備えた、ガス系消火設備。 A duct for discharging the fire extinguishing gas from the protected area where the fire extinguishing gas is introduced, and
A gas-based fire extinguishing system provided in the duct and provided with a means for increasing the flow rate of the fire extinguishing agent gas in the duct. 前記消火剤ガスの流量を増加させる手段は、消火剤ガスの流速および密度の少なくともいずれかを増加させることを含む、請求項１に記載のガス系消火設備。 The gas-based fire extinguishing system according to claim 1, wherein the means for increasing the flow rate of the fire extinguishing agent gas includes increasing at least one of the flow velocity and the density of the fire extinguishing agent gas. 前記消火剤ガスの流量を増加させる手段は、前記ダクト内に設けられる、請求項１に記載のガス系消火設備。 The gas-based fire extinguishing system according to claim 1, wherein the means for increasing the flow rate of the fire extinguishing agent gas is provided in the duct. 前記消火剤ガスの流量を増加させる手段は、前記ダクト外に設けられる、請求項１に記載のガス系消火設備。 The gas-based fire extinguishing system according to claim 1, wherein the means for increasing the flow rate of the fire extinguishing agent gas is provided outside the duct. 前記消火剤ガスの流量を増加させる手段は、ファンにより消火剤ガスの流速を増加させる、請求項１に記載のガス系消火設備。 The gas-based fire extinguishing equipment according to claim 1, wherein the means for increasing the flow rate of the fire extinguishing agent gas is to increase the flow velocity of the fire extinguishing agent gas by a fan. 前記消火剤ガスの流量を増加させる手段は、消火剤ガスを冷却することにより消火剤ガスの密度を増加させる、請求項１に記載のガス系消火設備。 The gas-based fire extinguishing equipment according to claim 1, wherein the means for increasing the flow rate of the extinguishing agent gas is to increase the density of the extinguishing agent gas by cooling the extinguishing agent gas. 消火剤ガスが導入される防護区画から消火剤ガスを排出するためのダクトを備え、
前記ダクトは前記防護区画が設けられる建物を縦方向に貫通する孔に接続される、ガス系消火設備。 Equipped with a duct for discharging the fire extinguishing gas from the protected area where the fire extinguishing gas is introduced.
The duct is a gas-based fire extinguishing system connected to a hole that vertically penetrates a building in which the protection section is provided.
JP2020195089A 2020-11-25 2020-11-25 Gas fire extinguishing equipment and construction method for the same Pending JP2021041209A (en)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06304260A (en) * 1993-04-20 1994-11-01 Ohbayashi Corp Smoke exhaust duct
JPH08299483A (en) * 1995-05-12 1996-11-19 Shimizu Corp Fire-proof structure of building
JP2010534543A (en) * 2007-08-01 2010-11-11 アムロナ・アーゲー Fire prevention or extinguishing method and fire prevention or extinguishing device in a closed space
JP2011104335A (en) * 2009-10-23 2011-06-02 Shimizu Corp Smoke extraction system and multistory building having the same
JP2012181012A (en) * 2012-06-15 2012-09-20 Air Water Safety Service Inc Depressurizing device for inactive gas fire-extinguishing equipment
JP2014108185A (en) * 2012-11-30 2014-06-12 Saikyu Kogyo Co Ltd Gas fire-extinguishing equipment

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06304260A (en) * 1993-04-20 1994-11-01 Ohbayashi Corp Smoke exhaust duct
JPH08299483A (en) * 1995-05-12 1996-11-19 Shimizu Corp Fire-proof structure of building
JP2010534543A (en) * 2007-08-01 2010-11-11 アムロナ・アーゲー Fire prevention or extinguishing method and fire prevention or extinguishing device in a closed space
JP2011104335A (en) * 2009-10-23 2011-06-02 Shimizu Corp Smoke extraction system and multistory building having the same
JP2012181012A (en) * 2012-06-15 2012-09-20 Air Water Safety Service Inc Depressurizing device for inactive gas fire-extinguishing equipment
JP2014108185A (en) * 2012-11-30 2014-06-12 Saikyu Kogyo Co Ltd Gas fire-extinguishing equipment

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