This Honeywell True HEPA Tower Allergen Remover Air Purifier is the #1 brand recommended by allergists. It's True HEPA filter captures up to 99.97% of microscopic allergens (0.3 microns or larger) such as mold spores, pollen, dust, smoke and pet dander. It also helps capture certain airborne germs. It circulates room air up to 5 times an hour and the activated carbon pre-filter helps reduce unpleasant odors. This air purifier has easy tap electronic controls: 3 air cleaning levels plus Turbo Clean setting, a 2, 4 and 8 hour timer, electronic filter replacement reminders, and control panel adjustable lighting (bright/dim/off). It is ENERGY STAR rated and recommended for medium rooms, 12'x13' (155 sq. ft.) The AHAM CADR (smoke) rating is 100. White.