Source: http://www.thriftyfun.com/tf393564.tip.html

What is a Forced Ventilation?

A type of building ventilation system that uses fans or blowers to provide fresh air to rooms when the forces of air pressure and gravity are not enough to circulate air through a building.

U.S. Department of Energy

Source: http://www.thriftyfun.com/tf393564.tip.html

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