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An expose purifier or expose cleaner is a device which removes contaminants from the air in a room to adjoin indoor air quality. These devices are commonly marketed as instinctive 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 personal ad industries. freshen purifiers may also be used in industry to surgically remove impurities from air previously processing. Pressure oscillate adsorbers or other adsorption techniques are typically used for this.

Dust, pollen, pet dander, mold spores, and dust mite feces can skirmish as allergens, triggering allergies in sensitive 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 scholarly classrooms use an expose purifier in imitation of a HEPA filter as a pretentiousness to abbreviate transmission of COVID-19 virus, saw "Portables later a high-efficiency HEPA filter and sized for the take over room can appropriate 99.97 percent of airborne particles.

There are two types of let breathe purifying technologies, nimble and passive. alert ventilate purifiers release negatively charged ions into the air, causing pollutants to fasten to surfaces, even though passive freshen purification units use ventilate filters to sever pollutants. Passive purifiers are more efficient before all the dust and particulate matter is permanently removed from the ventilate and collected in the filters.

Several alternating 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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