【Daily Topic】【HVAC Version 20160711】
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Participation reward: 2 Wealth. Reward for correct answer: 9 wealth. For local exhaust ventilation systems where gases, vapors, and dusts with explosive potential are present, the air flow rate should be calculated such that the concentration of these substances in the ducts does not exceed ( ) of the lower explosive limit, both under normal operating conditions and in emergency situations. a.10% b.30% c.50% d.60%
c.50%:hug::hug:
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 ( C ) of the lower explosive limit, both under normal operating conditions and in emergency situations. a.10% b.30% c.50% d.60%