| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a draft chamber for varying an exhaust air quantity in accordance with disturbances generated, thereby to keep a safe state at all times for a worker using it or a worker existing an installed room so that an energy saving and a reduction in a gas leakage concentration may coexist.SOLUTION: A draft chamber 1 comprises: a fan motor 31 as air feed/exhaust means for feeding air into a work space; disturbance detecting means 200 for detecting disturbances upon the draft chamber 1; and a control part 100 for controlling the air feed/exhaust means on the basis of the detection of the disturbance from the disturbance detection means 200 thereby to increase the exhaust air quantity to be discharged from the work space to the outside.</p> |
