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Different Forms of Air Filters

3/13/2013 11:07:37 AM | by Anonymous

Air Filters

Every time we are outside of our house, what we usually do to avoid air pollution is we cover our nose and mouth. At home, we try to prevent the dirt coming in by closing our windows and doors so our indoor air will stay clean. However, there is still no guarantee that the air we breathe inside the house is safe. The debris can sometimes be so fine that only air filters can sip the dirty particles.


Air filter is a device composed of fibrous materials capable of reducing the concentration of solid particles such as dust, mold, pollen and bacteria in an air stream to a level that can be tolerated in a process or space occupancy. Air filters have different forms. They are paper, foam, cotton and oil bath filters. The use of pleated paper elements is efficient, easy to repair and less costly that they have become the widespread choice for automobile. Oil-wetted polyurethane foam, on the other hand, is used as a replacement air filter. In the past, foam was widely used on small engines and other equipment, but has been largely displaced by automotive-type paper filter elements. Oiled cotton gauze, as open-meshed fabric, is not commonly used as an aftermarket automotive air filters. Cotton gauze has limited use in original-equipment automotive filters in the past. An oil bath air filter is composed of a sump containing a pool of oil, and an insert filled with fibre, foam, mosh or another course filter media. Oil bath air cleaners used to be the choice in small engine and automotive applications until the adoption of paper filter in the industry.


The use of air filters brings a lot of advantages. They prevent damage of ceilings, walls and equipment due to air-born particles. They can eliminate and minimize fire hazards and improve the shelf-life of perishable goods. Most importantly, air filters bring good health and less sickness because of clean and breathable environment.

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