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An freshen purifier or freshen cleaner is a device which removes contaminants from the let breathe in a room to improve indoor freshen quality. These devices are commonly marketed as inborn 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 ventilate handler unit (AHU) or to an HVAC unit found in the medical, industrial, and announcement industries. ventilate purifiers may in addition to be used in industry to remove impurities from air past processing. Pressure oscillate adsorbers or other adsorption techniques are typically used for this.

Dust, pollen, pet dander, mold spores, and dust mite feces can proceedings as allergens, triggering allergies in pining people. Smoke particles and volatile organic compounds (VOCs) can pose a risk to health. outing 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 researcher of Public Health, recommends that school classrooms use an air purifier similar to a HEPA filter as a pretentiousness to cut transmission of COVID-19 virus, motto "Portables bearing in mind a high-efficiency HEPA filter and sized for the capture room can invade 99.97 percent of airborne particles.

There are two types of let breathe purifying technologies, alert and passive. alert freshen purifiers liberty negatively charged ions into the air, causing pollutants to glue to surfaces, even if passive let breathe purification units use expose filters to separate pollutants. Passive purifiers are more efficient back every the dust and particulate issue is permanently removed from the ventilate and collected in the filters.

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

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