Clean the air in every room with the Blueair Blue Pure 221 air purifier. Activate the purifier at the touch of a button. It then automatically determines the operating speed required to clean the air in the room (maximum 50m2). This is all done silently too. The air is purified via filters. These are located across the entire underside of the purifier, and suck the air in from every direction. Dust, smoke, allergens, and bacteria don't stand a chance. In addition, the purifier is so energy efficient that its energy consumption is never more than that of a lightbulb.