Description
Actual dimensions are 20.75 x 20.75 x 4.38. Brand: Accumulair. 21x21x4.5 Ruud PD540012 replacement whole house filters, exactly designed to be an alternative to the name brand Ruud PD540012 air filters. Completely constructed - no assembly or combs required. MERV rated to ASHRAE specifications establishing particulate capture as good or better than the OEM Ruud PD540012 filter. Note: The sample filter image as shown is not true to size and is displayed for design only. Name brands and Ruud PD540012 identifier used for filter style identification.