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An freshen purifier or expose cleaner is a device which removes contaminants from the air in a room to complement indoor ventilate quality. These devices are commonly marketed as creature 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 little 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 announcement industries. ventilate purifiers may plus be used in industry to surgically remove impurities from freshen before processing. Pressure oscillate adsorbers or other adsorption techniques are typically used for this.

Dust, pollen, pet dander, mold spores, and dust mite feces can suit as allergens, triggering allergies in itch 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 theoretical of Public Health, recommends that researcher classrooms use an air purifier in the same way as a HEPA filter as a way to condense transmission of COVID-19 virus, maxim "Portables in imitation of a high-efficiency HEPA filter and sized for the invade room can commandeer 99.97 percent of airborne particles.

There are two types of let breathe purifying technologies, active and passive. swift ventilate purifiers forgiveness negatively charged ions into the air, causing pollutants to fasten to surfaces, though passive let breathe purification units use air filters to surgically remove pollutants. Passive purifiers are more efficient previously all the dust and particulate concern is continuously removed from the ventilate and collected in the filters.

Several interchange processes of changing 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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