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Where people are working, there has to be ______________ to cause proper ventilation of the premises.

(a) Air change

(b) Humidity

(c) Temperature

(d) Moisture

This question was addressed to me by my college director while I was bunking the class.

This question is from Types of Ventilation topic in portion Acoustics and Ventilation of Construction & Building Materials

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The correct choice is (a) Air change

Best explanation: The minimum and maximum rates of air change per hour is 1 and 60 respectively. If the rate of change is less than 1/hour, it will not create any appreciable effect of the ventilation system. On the other hand, at the rate of air changes more than 60/hour, it will result in discomfort due to high velocities of air.

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