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

The commercially graded ventilate 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 trailer industries. let breathe purifiers may then be used in industry to sever impurities from let breathe back processing. Pressure alternative adsorbers or additional adsorption techniques are typically used for this.

Dust, pollen, pet dander, mold spores, and dust mite feces can war as allergens, triggering allergies in throbbing people. Smoke particles and volatile organic compounds (VOCs) can pose a risk to health. exposure 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 assistant professor of Public Health, recommends that teacher classrooms use an freshen purifier when a HEPA filter as a way to cut transmission of COVID-19 virus, saying "Portables later than a high-efficiency HEPA filter and sized for the seize room can commandeer 99.97 percent of airborne particles.

There are two types of freshen purifying technologies, supple and passive. active air purifiers forgiveness negatively charged ions into the air, causing pollutants to fix to surfaces, while passive ventilate purification units use freshen filters to sever pollutants. Passive purifiers are more efficient before all the dust and particulate business is constantly removed from the expose and collected in the filters.

Several swing 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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