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An air purifier or expose cleaner is a device which removes contaminants from the ventilate in a room to augment indoor ventilate 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 ventilate purifiers are manufactured as either little 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 trailer industries. let breathe purifiers may plus be used in industry to remove impurities from let breathe previously processing. Pressure every other adsorbers or other adsorption techniques are typically used for this.

Dust, pollen, pet dander, mold spores, and dust mite feces can lawsuit as allergens, triggering allergies in pain 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 ill building syndrome.

Joseph Allen, director of the Healthy Buildings program at Harvard's moot of Public Health, recommends that teacher classrooms use an let breathe purifier considering a HEPA filter as a artifice to shorten transmission of COVID-19 virus, maxim "Portables behind a high-efficiency HEPA filter and sized for the occupy room can take control of 99.97 percent of airborne particles.

There are two types of let breathe purifying technologies, swift and passive. supple ventilate purifiers liberty negatively charged ions into the air, causing pollutants to stick to surfaces, even though passive air purification units use freshen filters to cut off pollutants. Passive purifiers are more efficient before all the dust and particulate business is for eternity removed from the ventilate and collected in the filters.

Several substitute processes of changing 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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