【Weekly Topic】【HVAC Version 20170111】
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This post was last edited by yuchenchf on 2017-1-19 at 10:52. Reward for participation: 2 Wealth. Correct reward: 9 Wealth. For local exhaust systems that exclude gases, vapors, and dusts with explosion hazards, the air volume should be calculated such that the concentration of these substances in the ducts does not exceed ( ) of the lower explosive limit under normal operating conditions as well as in emergency situations. A. 10% B. 30% C. 50% D. 60% C
For local exhaust systems that exclude gases, vapors, and dusts with explosion hazards, the air volume should be calculated such that the concentration of these substances in the ducts does not exceed the lower explosive limit under normal operating conditions as well as in emergency situations, by a factor of (C). A.10% B.30% C.50% D.60%