Captures up to 99.9% of microscopic particles at 0.3 microns or larger. Freshens air by absorbing odors. Helps reduce certain household VOC's and airborne gases. Easy-to-clean, permanent washable primary filter. Includes 2 pre-filters to choose from: washable or replaceable odor and gas reducing. 4 cleaning levels. 2, 4, and 8 hour timers, oscillation and allergen intelligence setting. AHAM CADR Smoke 98/for medium rooms.