Hunter 20310B Cube Tabletop Air Purifier with EcoSilver, Black/Silver True HEPA 2-in-1 filter (HEPA filter with built in Eco silver pre-filter.) Captures up to 99.97percent of airborne particles as small as 0.3-0.5 microns that passes through the unit including mold, spores, dust and pollen Eco silver pre-filter is antimicrobial, and inhibits the growth of microorganisms including bacteria and viruses The pre-filter helps remove common household odors, including cooking smoke, VOCs, and pet odors Clean air Delivery rate (CADR): 45; room size up to 135 sq. Ft