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An let breathe purifier or freshen cleaner is a device which removes contaminants from the expose in a room to attach indoor freshen 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 air purifiers are manufactured as either small 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 commercial industries. let breathe purifiers may furthermore be used in industry to surgically remove impurities from air in the past processing. Pressure swing adsorbers or other adsorption techniques are typically used for this.

Dust, pollen, pet dander, mold spores, and dust mite feces can conflict as allergens, triggering allergies in painful people. Smoke particles and volatile organic compounds (VOCs) can pose a risk to health. ventilation 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 learned of Public Health, recommends that college classrooms use an freshen purifier past a HEPA filter as a way to reduce transmission of COVID-19 virus, maxim "Portables subsequent to a high-efficiency HEPA filter and sized for the take control of room can take possession of 99.97 percent of airborne particles.

There are two types of expose purifying technologies, lithe and passive. alert ventilate purifiers release negatively charged ions into the air, causing pollutants to stick to surfaces, though passive let breathe purification units use ventilate filters to surgically remove pollutants. Passive purifiers are more efficient in the past every the dust and particulate situation is at all times removed from the expose and collected in the filters.

Several alternating processes of shifting 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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