LEVOIT LV-H133 Air Purifier freshest air in only 30 minutes in rooms as large as 1076ft², and 15 minutes in rooms as large as 538 ft². It completely filter room air about every 12 minutes on the highest speed. The certified H13 True HEPA Filter to remove 99.97% of airborne particles down to 0.3 microns, including pollen, dust, pet dander and more. The filters additional layer of 10x activated