Description
Actual size is 20.75 x 20.75 x 4.38. Brand: Accumulair. 21x21x4.5 Rheem Protech 540012 style whole house air filters, specifically designed to be an alternative to the OEM Rheem Protech 540012 air filters. Fully box-formed so no forming or combs needed. MERV classified to ASHRAE specifications establishing particle capture equal to the original brand Rheem Protech 540012 air filter. Notice: The sample filter pic displayed is not true to size and is there to show configuration purposes only. Name brands and Rheem Protech 540012 identifier are listed for air filter substitution purposes.