Source: http://www.thriftyfun.com/tf357940.tip.html

What is an Air Filter?

A device that removes contaminants, by mechanical filtration, from the fresh air stream before the air enters the living space. Filters can be installed as part of a heating/cooling system through which air flows for the purpose of removing particulates before or after the air enters the mechanical components.

U.S. Department of Energy

Source: http://www.thriftyfun.com/tf357940.tip.html

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