Fresh air can be hard to find, but it doesn’t have to be. The Levoit Tower True HEPA Air Purifier circulates fresh air multiple times per hour in rooms as large as 538 sq ft / 50 sq m. The 3-stage filtration system captures allergens, pet hair, dander, smoke, mold spores, odors, and large dust particles, in addition to removing 99.97 percent of airborne contaminants as small as 0.3 microns. The LV-H133-RBK Air Purifier's Auto Mode adjusts fan speeds based on the surrounding air quality, and real-time air updates keep you in the know. Enjoy fresh air anywhere in your home with the Levoit Tower True HEPA Air Purifier. Purchase replacement filter LV-H133-RF at walmart.com: https://www.walmart.com/ip/Levoit-LV-H133-Replacement-Filter/553909439.