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The Function of Air Filters

The Function of Air Filters

Aug 23, 2019

An air filter is usually made of a spun fiberglass material or from pleated paper or cloth enclosed in a cardboard frame. Its basic function is to clean the air that circulates through your heating and cooling system. Filters trap and hold many types of particulates and contaminants that could affect your health and comfort, including:

Dust and dirt


Mold and mold spores

Fibers and lint

Metal, plaster or wood particles

Hair and animal fur

Bacteria and microorganisms

Filtration usually occurs when expended air is brought back into the HVAC equipment to be conditioned and distributed again. The air is forced through the filter, and the material removes particulates and other contaminants from the air.