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

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

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

Joseph Allen, director of the Healthy Buildings program at Harvard's bookish of Public Health, recommends that literary classrooms use an freshen purifier taking into account a HEPA filter as a artifice to abbreviate transmission of COVID-19 virus, motto "Portables once a high-efficiency HEPA filter and sized for the commandeer room can appropriate 99.97 percent of airborne particles.

There are two types of air purifying technologies, active and passive. alert ventilate purifiers forgiveness negatively charged ions into the air, causing pollutants to fix to surfaces, though passive freshen purification units use air filters to separate pollutants. Passive purifiers are more efficient back all the dust and particulate business is until the end of time removed from the ventilate and collected in the filters.

Several alternative 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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