AC350 Air Purifier, Circulates Clean Air In The Room Up To 220 SQFT, 2 Filters Provides 3 Stage Filtration, Carbon Filter Captures Odor Particles & Is A Pre-Filter For Larger Particles, True HEPA Filter Removes 99.97% Of Airborne Allergens & Particles, 3 Speeds, Push Button Electronic Controls, Filter Replacement Indicators, CADR Ratings: Smoke 136, Dust 148, & Pollen 148, For Replacement Carbon Filter Use TV #168-913 & For Replacement HEPA Filter Use TV #177-019, 5 Year Warranty.