The Goodman M8-1056 20x25x5 media filter is a highly efficient filter that captures unwanted indoor air particles. The actual size of the filter is 20.25"x25.375"x5.25". It fits G52025-11, G-52025, G5202511: Goodman FS2025, Electro-Coleman CEMU2025, York YMU2025, Air EAMU2025, Amana AMU20x25, Bryant/ Carrier/ Payne/Totaline P102-2025, P102-NC20A Nordyne 9183970. (M81056)(NM81056)(MU2025X3) Convert Your Amana ASAS-18 EAC to a Media Filter System, also Goodman GSAS-18, BESTAIR PRO G5-2025-11, G5-2025, GA-5-2025-11, GA-5-2025-PR11. This filter lasts about 6 months depending on use. It is recommended to check your filter occasionaly to determine how often it should be replaced. Made by FUSA.