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

The commercially graded ventilate purifiers are manufactured as either small stand-alone units or larger units that can be affixed to an let breathe handler unit (AHU) or to an HVAC unit found in the medical, industrial, and billboard industries. let breathe purifiers may as a consequence be used in industry to remove impurities from expose back processing. Pressure substitute adsorbers or supplementary adsorption techniques are typically used for this.

Dust, pollen, pet dander, mold spores, and dust mite feces can encounter as allergens, triggering allergies in desire people. Smoke particles and volatile organic compounds (VOCs) can pose a risk to health. exposure to 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 theoretical of Public Health, recommends that scholarly classrooms use an ventilate purifier in the manner of a HEPA filter as a way to cut transmission of COVID-19 virus, proverb "Portables in imitation of a high-efficiency HEPA filter and sized for the invade room can take control of 99.97 percent of airborne particles.

There are two types of ventilate purifying technologies, supple and passive. supple air purifiers freedom negatively charged ions into the air, causing pollutants to pin to surfaces, even though passive air purification units use air filters to sever pollutants. Passive purifiers are more efficient in the past all the dust and particulate business is permanently removed from the freshen and collected in the filters.

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

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