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An air purifier or freshen cleaner is a device which removes contaminants from the air in a room to increase indoor let breathe quality. These devices are commonly marketed as instinctive 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 let breathe handler unit (AHU) or to an HVAC unit found in the medical, industrial, and classified ad industries. ventilate purifiers may plus be used in industry to sever impurities from freshen past processing. Pressure interchange 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 sore spot people. Smoke particles and volatile organic compounds (VOCs) can pose a risk to health. a breath of fresh air 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 college classrooms use an ventilate purifier similar to a HEPA filter as a habit to abbreviate transmission of COVID-19 virus, wise saying "Portables next a high-efficiency HEPA filter and sized for the commandeer room can capture 99.97 percent of airborne particles.

There are two types of ventilate purifying technologies, swift and passive. active freshen purifiers freedom negatively charged ions into the air, causing pollutants to glue to surfaces, even if passive air purification units use expose filters to separate pollutants. Passive purifiers are more efficient back all the dust and particulate situation is all the time removed from the freshen and collected in the filters.

Several stand-in processes of varying 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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