This Blueair system removes dust, pollen, smoke, gases and odors from your indoor environment to help you start breathing cleaner air. There are three fan settings, HEPASilent for nightime use, Moderate fan speed for daytime use, Maximum fan speed for fast initial cleaning or very polluted air. This air purifier is designed for maximum improvement of indoor air. The particle filter, which can be ordered, is made of 100% polypropylene, and contains no other chemical additives. The Blueair 200 series is energy efficient, and on the highest speed uses only 50 watts.