Description
Actual dimensions are 20.75 x 24.25 x 4.38. Accumulair brand 21x24x4.5 Rheem Protech 540020 substitute whole house filters, specifically designed to replace name brand Rheem Protech 540020 filters. Completely built so no forming or combs needed. MERV rated to ASHRAE ratings ensuring particle capture equal to the original manufacturer Rheem Protech 540020 air filter. Photo: The example air filter picture as shown is not true to size and is included to show style only. Brand names and Rheem Protech 540020 part numbers displayed for filter style identification only.