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In winter, it becomes necessary to supplied slightly _________ air to the inside of the building.

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In winter, it becomes necessary to supplied slightly _________ air to the inside of the building.

(a) Cool

(b) Heated

(c) Humid

(d) Dehumidified

I got this question by my college professor while I was bunking the class.

This interesting question is from Variations in Ventilation System with Climate topic in chapter Acoustics and Ventilation of Construction & Building Materials

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Correct option is (b) Heated

The explanation: During winter, heating of air will also compensate for heat loss from the room. The preheating of incoming air may be carried out by warm air furnaces or by coils around which hot water or steam is circulating. The incoming air is allowed to pass over warm air furnaces before it enters the room.

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