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2. Air purifier - Wikipedia

   en.wikipedia.org/wiki/Air_purifier

   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 .

3. 21 Best Air Purifier and Vacuum Deals From Amazon Prime Day - AOL

   www.aol.com/entertainment/21-best-air-purifier...

   Us Weekly has affiliate partnerships so we may receive compensation for some links to products and services. Amazon Prime Day is finally here! Cancel your meetings and clear your schedules because ...

4. Smog tower - Wikipedia

   en.wikipedia.org/wiki/Smog_tower

   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 requires energy or power.

5. Purifier - Wikipedia

   en.wikipedia.org/wiki/Purifier

   Purifier(s) may refer to: Air purifier , a device that filters pollution out of the air Water purification , removing contaminants from water, sometimes using a water purifier

6. Air ioniser - Wikipedia

   en.wikipedia.org/wiki/Air_ioniser

   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 ...

7. Heating, ventilation, and air conditioning - Wikipedia

   en.wikipedia.org/wiki/Heating,_ventilation,_and...

   For example, six air changes per hour means an amount of new air, equal to the volume of the space, is added every ten minutes. For human comfort, a minimum of four air changes per hour is typical, though warehouses might have only two. Too high of an air change rate may be uncomfortable, akin to a wind tunnel which has thousands of changes per ...