| 摘要 |
PROBLEM TO BE SOLVED: To provide a draft chamber capable of preventing leakage of a harmful gas or the like into a room, suppressing the room from becoming a negative pressure and reducing the energy loss in the air control and further realizing comfortable working environment. SOLUTION: The draft chamber has an opening and shutting door 3 disposed at the front face, an intake duct 4 for sucking a gas in the chamber 1 and a ventilation port 7 which has louvers 6 (members for resisting to ventilation) and is disposed at the surface of a sidewall. Further, the ventilation port 7 is allowed to communicate with the outside through a space 9 in the ceiling of a room 12 and a ventilation duct 10 so that the open air is sucked into the chamber 1 through the ventilation port 7.
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