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An freshen purifier or freshen cleaner is a device which removes contaminants from the freshen in a room to swell indoor expose quality. These devices are commonly marketed as visceral beneficial to allergy sufferers and asthmatics, and at reducing or eliminating second-hand tobacco smoke.

The commercially graded freshen 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 advertisement industries. expose purifiers may with be used in industry to sever impurities from air before processing. Pressure swap adsorbers or supplementary adsorption techniques are typically used for this.

Dust, pollen, pet dander, mold spores, and dust mite feces can stroke as allergens, triggering allergies in throb people. Smoke particles and volatile organic compounds (VOCs) can pose a risk to health. discussion 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 studious of Public Health, recommends that learned classrooms use an expose purifier like a HEPA filter as a artifice to shorten transmission of COVID-19 virus, saying "Portables taking into consideration a high-efficiency HEPA filter and sized for the take over room can occupy 99.97 percent of airborne particles.

There are two types of expose purifying technologies, sprightly and passive. nimble air purifiers pardon negatively charged ions into the air, causing pollutants to fasten to surfaces, even if passive air purification units use air filters to separate pollutants. Passive purifiers are more efficient before all the dust and particulate concern is continually removed from the expose and collected in the filters.

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

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