Air filter

A particulate air filter is a device composed of fibrous or porous materials which removes particulates such as smoke, dust, pollen, mold, viruses, and bacteria from the air. Filters containing an adsorbent or catalyst such as charcoal (carbon) or baking sodamay also remove odors and gaseous pollutants, such as volatile organic compounds or ozone. Air filters are used in applications where air quality is important, notably in building ventilation systems engine, compressor, gas turbine compressor intakes equipment(autos, aircraft, construction) cabins. human-made environments (e.g., satellites, and Space Shuttles) Air filters are typically constructed of foam, pleated paper, cotton, or spun fiberglass. Oil bath air filters have fallen out of favour aside from niche uses. Air ionizers use a different method, static electric charge, than air filters to attract and remove dust particles but they may also be supplemented with an air filter.