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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) may also remove odors and gaseous pollutants such as volatile organic compounds or ozone. [1]
HEPA (/ ˈ h ɛ p ə /, high efficiency particulate air) filter, [1] also known as a high efficiency particulate arresting filter, [2] is an efficiency standard of air filters. [ 3 ] Filters meeting the HEPA standard must satisfy certain levels of efficiency.
Many filtration processes include more than one filtration mechanism, and particulates are often removed from the fluid first to prevent clogging of downstream elements. Particulate filtration includes: The coffee filter to separate the coffee infusion from the grounds. HEPA filters in air conditioning to remove particles from air.
The theory of filters and prefilters is well developed and has a plethora of definitions and notations, many of which are now unceremoniously listed to prevent this article from becoming prolix and to allow for the easy look up of notation and definitions. Their important properties are described later. Sets operations
Furthermore, some units may have third and fourth stage filtration. All separation and filtration systems used within the unit should be specified. [citation needed] A baghouse is an air pollution abatement device used to trap particulate by filtering gas streams through large fabric bags. They are typically made of glass fibers or fabric.
An air purifier or air cleaner is a device which removes contaminants from the air in a room to improve indoor air quality. These devices are commonly marketed as being beneficial to allergy sufferers and asthmatics , and at reducing or eliminating second-hand tobacco smoke .
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