A particulate air filter is a device composed of fibrous or porous materials which removes solid particulates such as dust, pollen, mold, and bacteria from the air.Air filters are used in applications where air quality is important, notably in building ventilation systems and in engines.

HVAC air filters (Heating, Ventilating, and Air Conditioning) are broad terms to describe difference types of air filters in HVAC field. HVAC terms include heat pump, air conditioner units, furnace unit, geothermal, window units.etc. HVAC filteris the same as air conditioner filters or furnace filters.