Enjoy the benefits of cleaner air without the expensive replacement filter costs. The QuietClean Air Purifier captures 99% of ultrafine airborne particles such as smoke, dust, pollen, pet dander and mold spores from the air that passes through the filters. It's easy to maintain; the permanent iFD filter and the foam pre-filter rinse clean in water. There are 3 air cleaning levels and a 4, 8, or 12 hour auto shutoff timer. Effective for medium to large sized rooms, and Energy Star qualified.