Basic furnace filters are designed to trap dust, dirt, and airborne particulates before they can get into the system and potentially damage the fan or the heating coil. More expensive filters perform the same role, plus they can enhance the air quality in your home by trapping bacteria, pollen, and mildew and mold spores. Since most of the air in your house circulates through your HVAC system, furnace filters are your first line of defense against dust and airborne allergens.
Typically you should change a basic, fiberglass, or paper furnace filter every one to two months.
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