Source: http://www.thriftyfun.com/tf626549.tip.html

What is Ventilation/Suction?

The act of admitting fresh air into a space in order to replace stale or contaminated air; achieved by blowing air into the space. Similarly, suction represents the admission of fresh air into an interior space by lowering the pressure outside of the space, thereby drawing the contaminated air outward.

EPA

Source: http://www.thriftyfun.com/tf626549.tip.html

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