A particulate air filter is a device composed of fibrous materials which removes solid particulates such as dust, pollen, mold, and bacteria from the air. A chemical air filter consists of an absorbent or catalyst for the removal of airborne molecular contaminants such as volatile organic compounds or ozone. Air filters are used in applications where air quality is important, notably in building ventilation systems and in engines.
Some buildings, as well as aircraft and other man-made environments (e.g., satellites and space shuttles) use foam, pleated paper, or spun fiberglass filter elements. Another method, air ionisers, use fibers or elements with a static electric charge, which attract dust particles. The air intakes of internal combustion engines and compressors tend to use either paper, foam, or cotton filters. Oil bath filters have fallen out of favor. The technology of air intake filters of gas turbines has improved significantly in recent years, due to improvements in the aerodynamics and fluid-dynamics of the air-compressor part of the Gas Turbines.
Read more about Air Filter: Automotive Cabin Air Filters, Internal Combustion Air Filters, Filter Classes
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“An innocent man is a sin before God. Inhuman and therefore untrustworthy. No man should live without absorbing the sins of his kind, the foul air of his innocence, even if it did wilt rows of angel trumpets and cause them to fall from their vines.”
—Toni Morrison (b. 1931)