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An air purifier or freshen cleaner is a device which removes contaminants from the let breathe in a room to insert 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 let breathe 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 billboard industries. freshen purifiers may also be used in industry to remove impurities from air past processing. Pressure different adsorbers or supplementary adsorption techniques are typically used for this.

Dust, pollen, pet dander, mold spores, and dust mite feces can combat as allergens, triggering allergies in sadness 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 sick building syndrome.

Joseph Allen, director of the Healthy Buildings program at Harvard's learned of Public Health, recommends that instructor classrooms use an air purifier behind a HEPA filter as a exaggeration to cut transmission of COVID-19 virus, axiom "Portables subsequently a high-efficiency HEPA filter and sized for the invade room can invade 99.97 percent of airborne particles.

There are two types of let breathe purifying technologies, active and passive. swift freshen purifiers liberty negatively charged ions into the air, causing pollutants to fix to surfaces, even though passive expose purification units use let breathe filters to remove pollutants. Passive purifiers are more efficient past every the dust and particulate thing is until the end of time removed from the air and collected in the filters.

Several exchange 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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