It's 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.

Several types of air filters are common in commercial HVAC systems: 1) Fiberglass filter. This throwaway air filter is the most common type. 2) Polyester and pleated filters. 3) High efficiency particulate arrestance (HEPA) filters. 4) Washable air filters.

Following are the best air filters 1) AIRx Health 1" MERV 13 Furnace Filters. 2) Honeywell FC100A1037 Ultra Efficiency 4" Furnace Filters. 3) Nordic Pure 4" Furnace Filters. 4) FilterBuy 1" Furnace Filters. 5) AIRx ALLERGY 1" Furnace Filters. 6) Filtrete Micro Allergen 4" Furnace Filters. 7) X6673 Lennox 4" Furnace Filters.