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

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

Dust, pollen, pet dander, mold spores, and dust mite feces can court case as allergens, triggering allergies in ache people. Smoke particles and volatile organic compounds (VOCs) can pose a risk to health. drying 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 literary of Public Health, recommends that moot classrooms use an expose purifier afterward a HEPA filter as a way to condense transmission of COVID-19 virus, saw "Portables later than a high-efficiency HEPA filter and sized for the seize room can capture 99.97 percent of airborne particles.

There are two types of let breathe purifying technologies, sprightly and passive. supple expose purifiers liberty negatively charged ions into the air, causing pollutants to fix to surfaces, even if passive expose purification units use expose filters to separate pollutants. Passive purifiers are more efficient since every the dust and particulate business is at all times removed from the ventilate and collected in the filters.

Several stand-in 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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