Air purifiers remove contaminants from the air. They come in many sizes and utilize several different technologies. Small stand alone units are designed for residential use. Large units designed for use in medical, industrial, and commercial industries are usually attached to air handling units (AHU) or heating, ventilation and air conditioning (HVAC) systems.
These devices are commonly marketed as being beneficial to allergy sufferers and asthmatics, and at reducing or eliminating second-hand tobacco smoke. Industry also uses air purifiers to remove impurities such as CO2 from air before processing.
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