Tier1 Replacement for Amana 20x20x5 Merv 13 MU2020 / M2-1056 Air Filter 2 Pack Upgraded media rated at MERV 13 to capture 90% of particles, 1 microns or smaller in size Replacement for: Goodman M2-1056, G2-1056, Nordyne 918396, Totaline P102-2020, P102-2020BB and other brand part numbers ending in MU2020 Original box type design This product is listed and rated by Underwriters Laboratories as U.L. Class 2