For cleaner, fresher air in the home, this QuietClean air purifier offers superior air-cleaning power with HEPA-filter performance. Its permanent filter works to remove up to 99 percent of harmful indoor particles such as dust, pollen, mold spores, cat dander, and tobacco smoke from air that passes through the filter. Designed for medium-size rooms up to 124 square feet, the purifier comes equipped with a powerful fan that quietly pulls air into the unit, circulating and filtering the air in the room several times each hour. For added convenience, the air purifier's advanced electronic controls allow for choosing from three speed settings and for setting the timer to automatically shut the unit off after 4, 8, or 12 hours. The permanent filter requires little maintenance and no expensive replacement filter costs--simply rinse it clean with water when signaled by the unit's electronic "filter-clean" indicator. In its attractive, space-saving slim-tower design, the air purifier measures approximately 12 by 10 by 29 inches and carries a five-year limited warranty.