20x20x1 Electrostatic Washable Permanent A/C Silver Steel Frame + 1 Filter Fresh Air Filter Pads Scented All Standard filters are generally undercut 3/8 inch, Replaces disposable furnace filters, Self-charging electrostatic filter media - does not require electricity, Lifetime warranty The air you breathe contains many irritants such as pollen, dust, bacteria, mold spores, pet dander and smoke. Most of these particles are smaller than one micron. Our ELECTROSTATIC FILTER is an effective and efficient way to reduce the number of these particles in your air. This unique characteristic improves air flow while providing maximum filtration. Your satisfaction is 100% guaranteed or your money back in 30 days risk free trial. Lifetime Warranty Never Buy Another Filter. The best filter on the market and the factory price to you, if not satisfied within 30-Day Risk Free Trial, low Air Flow Resistance and Frame Quality Excellent. Please return the items and did not ask anything! have your money back! UV light resistant. Just easily wash the filter every 1-3 months and put it back in place. The sturdy metal frame will stand the test of time. With a warranty Satisfaction and 100% money back guarantee, why not make the switch to a permanent air filter?Electrostatic and HEPA Air Filters. We offer permanent, metal-framed Washable Electrostatic filters. We are in the Indoor Air Quality business Never buy another filter. HEPA and electrostatic air filters. We offer a filter with a frame and galvanized wire mesh screening washable electrostatic filters. Sold by Kilowatts Energy CENTER These filters retail elsewhere for $ 99.99. We are in business to Improve Air Quality family