Tier1 Replacement for Lennox 20x25x5 Merv 8 X0586 Air Filter 2 Pack Rated at MERV 8 to capture particles 3-10 microns in size Replacement for: Lennox X0586, X5426, X6661, X6673, X6675, X8304, X8307, X7751, Honeywell F25F1026, F35F1024, F100F1038, 203720, FC35A1027 and FC100A1037 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