Furnace Air Filters

Written by Norene Anderson
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The type of air filters used in a forced-air furnace should be resistant to mold and mildew. A common place for mold and mildew to hide and thrive is in the ductwork or coils of the heating and cooling unit. Ductwork insulation provides an excellent media for growth with the porous surface, moisture, and dust. The filter is a ready growth media with the right moisture content and warmth. Buy only mold and mildew retardant filters.

The unit should be examined carefully by a plumber or specialist in heating and air conditioning systems for any leaks where moisture can collect. To eliminate the mold spores in the air, all areas where humidity and warmth are combined should be carefully checked. This includes the vent for clothes dryers, especially if vented indoors or to an attic. Bathrooms without exhaust fans provide an excellent opportunity for mold growth.

The Best Furnace Air Filters

Furnace air filters are necessary to remove the smallest particles in the air. An ideal range of particulates to capture is from 0.01 to 100 microns. This span will cover most of the common airborne particles found indoors. To get a clear picture of the size of microns, the diameter of a human hair is approximately 250 microns. Tiny particles include pollen, dust, dust mites, smoke, and other allergens.

A pleated furnace air filter is more efficient and more expensive than the standard flat filter. Make sure the filter will operate safely with the existing unit without over-pulling the motor. Check for the limit on airflow restrictions. If you question the acceptable use of a filter, always check with the manufacturer of the filter or the forced-air heating and cooling system.


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