DESC: Refresh the air in any room, with a whisper-quiet fan completing 3 air changes every hour Permanent, washable Forever Filter is an economical feature Filtration removes up to 95% of common airborne pollutants Reduces dust and minimizes mold spores, dust mites, dirt and animal dander 5Hx15.5Wx11D" designed for use in spaces up to 200 sq. ft.