Purifier captures up to 99.97% of airborne particles as small as 0.3 microns, including bacteria, allergens, mold, pollen, smoke, dander and dust. Carbon pre-filter helps neutralize odors. Quiet operation. Completely circulates room air five times per hour. Includes three air cleaning levels and TURBO clean setting. Features easy tap electronic controls. Contains electronic filter replacement indicators. Air Cleaner Machine Type: True HEPA; CADR: 320 (Dust); 300 (Pollen); 300 (Smoke); Maximum Room Size (Square Footage): 465 sq ft; Maximum Room Size: 21 x 22.