Posts Tagged ‘howto’
Foam Filter
Saturday, August 27th, 2011
What is air Filter?
<h1>Air FIlter in Wisconsin</h1>
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.
Air purifiers and air cleaners are terms that are synonymous with each other, and we have written, researched and published a great deal about air cleaning, indoor air quality and air purifiers over recent years. This is a guide to everything we have written on the subject and the questions we are asked most often about air purifiers. Some of what we have written about air purifiers we consider to be more worthy of your reading than others. We have designated the articles that we think are best with a graphic light bulb as “best read” for air purifiers.
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.
Air filters of many types and materials of construction have been designed, manufactured, and applied to meet a wide variety of industrial and commercial requirements for clean air (e.g., industry makes full use of all filter types). Commercially available filters are divided into three distinct categories based on how they operate to remove suspended particulate matter from the air passing through them. The largest category, often referred to as ventilation or heating, and air conditioning (HVAC) filters, is composed of highly porous beds of resin-bonded glass or plastic fibers with diameters ranging from 1 to 40 micrometers (µm). The fibers act as targets for collecting airborne dust. As their name indicates, HVAC filters are widely used for air cleaning in mechanical ventilation systems. They are almost all single-use, disposable items, and are used in all sectors of industry, including as pre-filters that reduce the amount of coarse dust reaching more efficient filters located downstream.
Typical HVAC filters:
Fiberglass Filter: Typically manufactured using medium to heavy cardboard frame with layered fiberglass reinforced with a metal mesh for support from collapse. Used in most HVAC filtration applications.
Polyester Filter Media Pad: Polyester offers higher resistance and dust holding capabilities than most fiberglass filters. Frequently used to replace fiberglass filters, which can fragment and send fibers into the air stream. Used in most HVAC filtration applications.
Electrostatic Filter: These filters create a self-generated charge helping to collect dust particles. These filters are typically manufactured using multiple layers of polypropylene media or similar within a galvanized frame or cardboard frame.
A second category also is comprised of single-use, disposable filters called HEPA filters. By definition, a HEPA filter is a throwaway, extended-medium, dry-type filter with: (1) a minimum particle removal efficiency of no less than 99.97 percent for 0.3-µm particles, (2) a maximum resistance, when clean, of 1.0 inches water gauge (in.wg) when operated at 1,000 cfm, and (3) a rigid casing that extends the full depth of the medium [Note: Filters of different flows and resistances are allowable by the AG-1 Code. 2 A filter of identical construction and appearance, but having a filtering medium with a retention of 99.9995 percent for 0.1 µm particles, is referred to as an ultra-low penetration aerosol filter (ULPA). The filtering medium of HEPA filters is thinner and more compressed, and contains smaller diameter fibers than HVAC filters. HEPA filters are widely used throughout industry.
http://www.filter-supply.com/
About the Author
Filtration Solutions Inc. (FSI)
Filter Supply is leading manufacturer of Air Filters, Water Filters, HVAC Filters, Hydraulic Filters in Wisconsin. Producers of Best Quality Filters and Filtration Solutions in USA since 20 years.
http://www.filter-supply.com/
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