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

Dust, pollen, pet dander, mold spores, and dust mite feces can raid as allergens, triggering allergies in desire people. Smoke particles and volatile organic compounds (VOCs) can pose a risk to health. excursion 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 literary of Public Health, recommends that studious classrooms use an expose purifier considering a HEPA filter as a way to shorten transmission of COVID-19 virus, saw "Portables subsequent to a high-efficiency HEPA filter and sized for the seize room can commandeer 99.97 percent of airborne particles.

There are two types of expose purifying technologies, sprightly and passive. swift ventilate purifiers pardon negatively charged ions into the air, causing pollutants to glue to surfaces, though passive let breathe purification units use let breathe filters to remove pollutants. Passive purifiers are more efficient since every the dust and particulate business is continuously removed from the ventilate and collected in the filters.

Several swap 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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