Air Purifier

An air purifier is a device that draws in air from a room and removes contaminants such as dust, pollen, smoke particles and some odors before releasing the cleaned air back into the space, most commonly by pulling it through a mechanical filter such as a HEPA filter, though some models also use activated carbon, ultraviolet light or electrostatic methods. They are used in homes, offices, hospitals and industrial settings to reduce indoor concentrations of particulates and, in some designs, certain gases, and their effectiveness is generally rated by the volume of air they can clean per hour relative to the size of the room. Portable units and whole building systems both exist, with whole building systems typically integrated into a structure's own heating and cooling ductwork.