Cleaning the air has been taken to another level with this Permanent HEPA-Type Air Purifier with Germicidal Protection. The permanent washable filter is not only 99% efficient at removing airborne particles such as dust, pollen, cat dander and tobacco smoke, but it also helps reduce airborne bacteria, fungus and mold spores from the air that passes through the filter. With a permanent, washable filter, you wont have to worry about purchasing replacement filters. Cleaning the filter is simple just remove, water-rinse and let air dry. The LCD filter monitor graphically shows you when to clean the filter. The digital 3 speed controls allow for ease of operation and have a programmable 1-10 hour auto-off timer. Theres no need to be worried about high operating costs this unit comes with a 5 year limited warranty. Recommended for rooms up to 169 sq. ft. (13 ft. x 13 ft.).