Permanent True HEPA Round Air Purifier helps remove 99.97 percent of all the airborne particles from the air passing through it, including pollen, cat dander, household dust, tobacco smoke and mold spores. LifeTime permanent filter can be vacuumed. Air purifier offers three speeds, clean filter reminder, patented 360-degree air intake and discharge for effective air cleaning power. Carbon prefilter helps reduce odors and extends HEPA filter life. Certified by the Association of Home Appliance Manufacturers.