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An freshen purifier or expose cleaner is a device which removes contaminants from the freshen in a room to intensify indoor freshen quality. These devices are commonly marketed as physical 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 advertisement industries. air purifiers may as well as be used in industry to surgically remove impurities from let breathe back processing. Pressure substitute adsorbers or other adsorption techniques are typically used for this.

Dust, pollen, pet dander, mold spores, and dust mite feces can clash as allergens, triggering allergies in ache people. Smoke particles and volatile organic compounds (VOCs) can pose a risk to health. ventilation 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 speculative of Public Health, recommends that intellectual classrooms use an ventilate purifier in the manner of a HEPA filter as a pretentiousness to abbreviate transmission of COVID-19 virus, saw "Portables next a high-efficiency HEPA filter and sized for the commandeer room can take control of 99.97 percent of airborne particles.

There are two types of ventilate purifying technologies, active and passive. active freshen purifiers pardon negatively charged ions into the air, causing pollutants to pin to surfaces, even if passive ventilate purification units use freshen filters to surgically remove pollutants. Passive purifiers are more efficient back all the dust and particulate matter is for eternity removed from the air and collected in the filters.

Several interchange 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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