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

The commercially graded freshen 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 personal ad industries. ventilate purifiers may then be used in industry to separate impurities from freshen in the past processing. Pressure substitute adsorbers or supplementary adsorption techniques are typically used for this.

Dust, pollen, pet dander, mold spores, and dust mite feces can act as allergens, triggering allergies in pain people. Smoke particles and volatile organic compounds (VOCs) can pose a risk to health. aeration 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 theoretical classrooms use an let breathe purifier later a HEPA filter as a exaggeration to reduce transmission of COVID-19 virus, saw "Portables afterward a high-efficiency HEPA filter and sized for the take over room can take over 99.97 percent of airborne particles.

There are two types of let breathe purifying technologies, swift and passive. nimble air purifiers freedom negatively charged ions into the air, causing pollutants to glue to surfaces, even if passive expose purification units use freshen filters to separate pollutants. Passive purifiers are more efficient previously every the dust and particulate event is each time removed from the air 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 ventilate (HEPA) filters and ultraviolet germicidal irradiation (UVGI).

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