| 摘要 |
PROBLEM TO BE SOLVED: To maintain the exhaust function even if the temperature of flue gas gets over the operation temperature of a fireproof damper. SOLUTION: This system exhausts the smoke generated in a room 4 through an exhaust duct 13 and a fireproof damper 15 by means of an exhaust fan 10. In this case, this is of such constitution that a bypass duct 1 for intake of outside air is connected to the exhaust duct 13, and also this is equipped with a pressurizing fan 9 which supplies a room 4 and a ceiling chamber 6 with outside air, and this may be arranged such that the bypass duct 17 is opened within the ceiling chamber 6 through a check valve 18.
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