Tier1 Replacement for White-Rodgers 20x25x4 Merv 8 FR2000M-100 Air Filter 2 Pack Rated at MERV 8 to capture particles 3-10 microns in size Replacement for: White-Rodgers FR2000M-108 and FR2000M-111 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