The new Blueair 201 in-room air purifier is the only air purifier with its room capacity to use HEPASilent technology a combination of the best features of electrostatic and mechanical filter technology that allows delivery of more clean air at a faster rate with less noise. The 201 is among the highest energy efficient and quietest operating air purifiers in its class with a room capacity of 200 sq. ft (10 x 20 ft room). The unit is available in white or silver. Blueair is the system for people living with allergies asthma or other respiratory conditions or for anyone who wants cleaner more breathable air.