Actual Dimensions: 19.13 x 19.88 x 4.25. Accumulair brand, 19x20x4.5 Carrier FILBBFNC0021 style whole house air filters, exactly designed to replace the original brand Carrier FILBBFNC0021 filters. Completely built - no forming or combs required. MERV graded to ASHRAE specifications establishing function equal to the original brand Carrier FILBBFNC0021 air filters. Notice: Sample air filter image shown is not to scale and is shown for configuration purposes only. Company names and Carrier FILBBFNC0021 P/N included for air filter substitution identification purposes.
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