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What is an air filter? An air filter (or furnace filter) serves to stop dust, dander, and other particles from entering your furnace, and, by extension, from your air ducts and the rest of your home. The air that is moved by your heating and cooling system is circulated throughout your home several times a day. Housed in the filter compartment, and sandwiched between the end of the return duct and the blower compartment, the air filter keeps not only your HVAC system clean, but it also helps to keep your entire home clean by preventing contaminant buildup in the air ducts, which supply your household air. If your air ducts are dirty, some of that dirt necessarily will be contained in the indoor air you breathe daily. (Want to learn more about the process of air duct cleaning? Visit our air duct cleaning service page.)