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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 .
Smog free tower in Beijing. Smog towers or smog free towers (see below for other names) are structures designed as large-scale air purifiers to reduce air pollution particles . This approach to the problem of urban air pollution involves air filtration and removal of suspended mechanical particulates such as soot and
Ventilation with outdoor air containing elevated ozone concentrations may complicate remediation attempts. [69] The WHO standard for ozone concentration is 60 μg/m 3 for long-term exposure and 100 μg/m 3 as the maximum average over an 8-hour period. [29] The EPA standard for ozone concentration is 0.07 ppm average over an 8-hour period. [70]
Holmes Products was founded by Jordan Kahn in 1982. [ 1 ] [ 2 ] In 2005, Berkshire Partners , Holmes' parent company, sold Holmes Products to Jarden Corporation for US$ 625.9 million. At the time of the sale, the brands of Holmes included Rival (acquired in 1999 [ 3 ] ), Crock-Pot , Bionaire and White Mountain.
Air ioniser and purifier with its dust collection plates removed. Air ionisers are used in air purifiers to remove particles from air. [3] Airborne particles become charged as they attract charged ions from the ioniser by electrostatic attraction. The particles in turn are then attracted to any nearby earthed (grounded) conductors, either ...
These include chlorofluorocarbons and hydrofluorocarbons, both of which cause ozone depletion (although the latter much less so) and contribute to global warming. 'Freon' is the brand name for the refrigerants R-12 , R-13B1 , R-22 , R-410A , R-502, and R-503 manufactured by The Chemours Company, and so is not used to label all refrigerants of ...