Honeywell Quiet Clean Tower Air Purifier with Permanent Filters Nullify Imported Patented if high performance filters help capture up to 99Percent of airborne particles like pollen, dust, pet dander, mold spores and Smoke1 Permanent, washable filters and pre-filter. Optional odor & VOC reducing pre-filter (hrf-k2) Included. This filter is not washable and should be replaced every 3 months 3 cleaning levels with easy to useled touch button control panel AHAM verified for use in rooms up to 170 square feet. Clean air Delivery rates (CADR): 110 smoke, 100 dust, 132 Pollen7 Energy star Qualified6