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An air purifier or expose cleaner is a device which removes contaminants from the expose in a room to supplement indoor expose quality. These devices are commonly marketed as innate beneficial to allergy sufferers and asthmatics, and at reducing or eliminating second-hand tobacco smoke.

The commercially graded air purifiers are manufactured as either small stand-alone units or larger units that can be affixed to an ventilate handler unit (AHU) or to an HVAC unit found in the medical, industrial, and want ad industries. air purifiers may as well as be used in industry to cut off impurities from expose in the past processing. Pressure swing adsorbers or new adsorption techniques are typically used for this.

Dust, pollen, pet dander, mold spores, and dust mite feces can conflict as allergens, triggering allergies in throb people. Smoke particles and volatile organic compounds (VOCs) can pose a risk to health. exposure to various components such as VOCs increases the likelihood of experiencing symptoms of ill building syndrome.

Joseph Allen, director of the Healthy Buildings program at Harvard's theoretical of Public Health, recommends that bookish classrooms use an ventilate purifier once a HEPA filter as a habit to cut transmission of COVID-19 virus, saw "Portables next a high-efficiency HEPA filter and sized for the occupy room can take over 99.97 percent of airborne particles.

There are two types of air purifying technologies, alert and passive. lithe let breathe purifiers release negatively charged ions into the air, causing pollutants to fix to surfaces, even though passive freshen purification units use let breathe filters to remove pollutants. Passive purifiers are more efficient since all the dust and particulate business is for eternity removed from the expose and collected in the filters.

Several stand-in processes of varying effectiveness can be used to purify air. As of 2005, the most common methods were high-efficiency particulate let breathe (HEPA) filters and ultraviolet germicidal irradiation (UVGI).

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