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An freshen purifier or expose cleaner is a device which removes contaminants from the expose in a room to count indoor ventilate quality. These devices are commonly marketed as brute 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 ventilate handler unit (AHU) or to an HVAC unit found in the medical, industrial, and poster industries. freshen purifiers may as a consequence be used in industry to separate impurities from ventilate back processing. Pressure interchange adsorbers or other adsorption techniques are typically used for this.

Dust, pollen, pet dander, mold spores, and dust mite feces can act as allergens, triggering allergies in sore 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 hypothetical of Public Health, recommends that literary classrooms use an freshen purifier taking into account a HEPA filter as a pretension to cut transmission of COVID-19 virus, proverb "Portables gone a high-efficiency HEPA filter and sized for the appropriate room can take possession of 99.97 percent of airborne particles.

There are two types of expose purifying technologies, sprightly and passive. supple let breathe purifiers liberty negatively charged ions into the air, causing pollutants to attach to surfaces, even though passive ventilate purification units use freshen filters to surgically remove pollutants. Passive purifiers are more efficient since all the dust and particulate matter is for all time removed from the let breathe and collected in the filters.

Several swap processes of shifting 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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