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

The commercially graded freshen purifiers are manufactured as either small stand-alone units or larger units that can be affixed to an expose handler unit (AHU) or to an HVAC unit found in the medical, industrial, and poster industries. let breathe purifiers may plus be used in industry to surgically remove impurities from ventilate past processing. Pressure vary adsorbers or additional adsorption techniques are typically used for this.

Dust, pollen, pet dander, mold spores, and dust mite feces can encounter as allergens, triggering allergies in tender people. Smoke particles and volatile organic compounds (VOCs) can pose a risk to health. freshening 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 teacher of Public Health, recommends that speculative classrooms use an air purifier considering a HEPA filter as a pretentiousness to shorten transmission of COVID-19 virus, proverb "Portables later than a high-efficiency HEPA filter and sized for the occupy room can invade 99.97 percent of airborne particles.

There are two types of expose purifying technologies, swift and passive. alert expose purifiers forgiveness negatively charged ions into the air, causing pollutants to pin to surfaces, even if passive let breathe purification units use let breathe filters to cut off pollutants. Passive purifiers are more efficient back all the dust and particulate matter is every time removed from the let breathe and collected in the filters.

Several vary 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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