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This post was last edited by hanyu*a8 on 2015-10-14 at 16:05. When a mechanical ventilation system uses partially recirculated air, the concentration of harmful gases, vapors, and dust in the air supplied to the workplace should not exceed ( ) of the specified exposure limits. A 20% B 30% C 50% D 60%
When a mechanical ventilation system uses partially recirculated air, the concentration of harmful gases, vapors, and dust in the air supplied to the workplace shall not exceed (B 30%) of the specified exposure limit.
When a mechanical ventilation system uses partially recirculated air, the concentration of harmful gases, vapors, and dust in the air supplied to the workplace shall not exceed (B) times the specified exposure limit.
The answer is B, thirty percent
B, 30%----------------------------------------------
When a mechanical ventilation system uses partially recirculated air, the concentration of harmful gases, vapors, and dust in the air supplied to the workplace shall not exceed (A 20%) of the specified exposure limit.
When a mechanical ventilation system uses partially recirculated air, the concentration of harmful gases, vapors, and dust in the air supplied to the workplace shall not exceed (B) of the specified exposure limits. A 20% B 30% C 50% D 60%
When a mechanical ventilation system uses partially recirculated air, the concentration of harmful gases, vapors, and dust in the air supplied to the workplace shall not exceed (B) of the specified exposure limits.
When a mechanical ventilation system uses partially recirculated air, the concentration of harmful gases, vapors, and dust in the air supplied to the workplace shall not exceed (B) of the specified exposure limits. A 20% B 30% C 50% D 60%
It should not exceed 30% of the specified exposure limit B