Tier1 Replacement for Lennox 20x20x5 Merv 13 X0585 Air Filter 2 Pack Upgraded media rated at MERV 13 to capture 90% of particles, 1 microns or smaller in size Replacement for: Lennox X0585, X8305, X8308, X7930, X7935 and Trion Air Bear 255649-102 98% efficient filter media that captures small dust particles before they can collect on your coils This product is listed and rated by Underwriters Laboratories as U.L. Class 2