A key to a healthy, comfortable home is ventilation. The use of exhaust fans, ceiling fans, and bath fans can keep a home's indoor air quality from becoming too humid, dry, stale, dusty, or mildew ridden. Although you can control humidity with a dehumidifier and dry air with a humidifier, those alone don't necessarily provide good ventilation. With the use of heat exchangers, for instance, you can pump out the old, stale air and replenish it with new, clean, crisp air. The best part is that this air is run through a filtering system to draw out most of the pollutants.
...Source: http://electrical.about.com/b/2014/02/27/2947.htm
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