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An expose purifier or ventilate cleaner is a device which removes contaminants from the ventilate in a room to attach indoor freshen 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 small stand-alone units or larger units that can be affixed to an air handler unit (AHU) or to an HVAC unit found in the medical, industrial, and trailer industries. let breathe purifiers may also be used in industry to separate impurities from let breathe since processing. Pressure substitute adsorbers or additional adsorption techniques are typically used for this.

Dust, pollen, pet dander, mold spores, and dust mite feces can accomplishment as allergens, triggering allergies in ache 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 scholastic of Public Health, recommends that scholarly classrooms use an expose purifier in imitation of a HEPA filter as a quirk to shorten transmission of COVID-19 virus, proverb "Portables considering a high-efficiency HEPA filter and sized for the appropriate room can commandeer 99.97 percent of airborne particles.

There are two types of let breathe purifying technologies, responsive and passive. active ventilate purifiers liberty negatively charged ions into the air, causing pollutants to fasten to surfaces, while passive expose purification units use freshen filters to surgically remove pollutants. Passive purifiers are more efficient past all the dust and particulate matter is every time removed from the air and collected in the filters.

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

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