Actual Size: 20.25 x 25.38 x 5.25. Accumulair brand, 20x25x5 Westinghouse BB2025 replacement whole house air filters, exactly designed to substitute for the OEM Westinghouse BB2025 filters. Fully constructed so no assembly or combs needed. MERV graded to ASHRAE 52.2 test grades ensuring particle filtration to the level of the original brand Westinghouse BB2025 air filters. Notice: Example air filter pic shown is not true to size and is included to show configuration only. OEM names and Westinghouse BB2025 identifier are listed for filter replacement identification use.