Description
Actual Dimensions: 20.75 x 20.75 x 4.38. Brand: Accumulair. 21x21x4.5 Ruud PD540012 replacement whole house filters, specifically designed to replace original manufacturer Ruud PD540012 air filters. Completely assembled with no assembly or combs required. MERV rated to ASHRAE 52.2 test grades assuring function equal to the OEM Ruud PD540012 filter. Photo: The sample air filter pic displayed is not true to size and is included to show configuration purposes. OEM names and Ruud PD540012 P/N are included for air filter substitution identification use.