Panasonic FY-520XT Air Purifier Replacement Charcoal Filter This is an O.E.M. Authorized part Fits with various Panasonic brand models Oem part # F-Y520XT Replacement filter for air purifier model number F-P20HU1 Leverages an activated charcoal system to reduce unpleasant odors Clear installation instructions provided; includes filter change indication label Lasts approximately 1-year; no maintenance required Measures 18-1/2 by 1/4 by 14 inches; made in Japan