Reduces Odors: Charcoal filter reduces common odors from pets, smoking and cooking. AHAM Verified and Energy Star Certified: 22 inch 3 speed tower is best used for rooms up to 153 Sq. Ft. Filters and circulates room air over 4x per hour. The higher the CADR the faster the unit filters the air. CADR Dust (107), Pollen (116) and Smoke (99). Filter Replacement Indicator: Only one single filter needs to be replaced every 6-8 months depending on the use of the product; Replacement filter is filter B Pet (model FLT4850PT). To lengthen the life of your filter, a 4 pack of the carbon filters is also available (model FLT22CB4). UV-C Replacement Bulb LB4000. IMPORTANT: Use genuine Guardian Technologies replacement parts to maintain product performance. 3 year lmited manufacturer warranty.