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. Filters containing an adsorbent or catalyst such as charcoal (carbon) may 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 and in engines.
Some buildings, as well as aircraft and other human-made environments (e.g., satellites, and Space Shuttles) use foam, pleated paper, or spun fiberglass filter elements. Another method, air ionizers, use fibers or elements with a static electric charge, which attract dust particles. The air intakes of internal combustion engines and air compressors tend to use either paper, foam, or cotton filters. Oil bath filters have fallen out of favour aside from niche uses. 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.
DIY projects on Appropedia[edit | edit source]
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Baghouse[edit | edit source]
A baghouse also known as a fabric filter dust collector is an air pollution control device that removes particulates rom a gas stream. Baghouses are often employed in large industrial applications such as power generation, steel mills, chemical production and manufacturing plants to capture air pollutants generated during normal operation. In many countries environmental regulation essentially mandates the installation and operation of a baghouse system achieve a reduction of hazardous air emissions from industrial sources. Additionally, in some instances the baghouse functions to recover product as part of the industrial process such as by collecting precious metals or pharmaceutical dusts created during manufacturing. Baghouses are also used for workplace safety purposes such as the prevention of combustible dust explosions and reducing worker exposure to harmful compounds.
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