A solution for filtering circulated household air, Electrostatic Air Filters can clean air up to 6 times more efficiently than a typical fiberglass filter. They are made up of several layers of various paper or plastic filter media that carries a built-in electric charge for trapping the airborne particles such as dust, pollen and dander. Most are washable. Features of various filters can include a long lasting and highly washable anti-bacterial filter, carbon monoxide detectors, and beeping to tell you the filter needs to be washed.