This Bionaire germ-reducing UV-powered HEPA-type air purifier removes up to 99% of airborne allergens and pollutants.The easy-to-use touch-button control panel features germicidal UV technology, proven to help reduce germs, viruses, bacteria, mold and fungi from the air.And, the permanent filter NEVER needs replacing!For medium rooms up to 236 sq. feet. Choose from 3 cleaning speeds. Includes an optional ionizer. CADR ratings: Tobacco smoke 152; Dust 153; Pollen 174