Description
Actual Size: 20.75 x 24.25 x 4.38. Brand: Accumulair. 21x24x4.5 Ruud PD540020 style whole house filters, exactly designed to be an alternative to the original manufacturer Ruud PD540020 air filters. Completely assembled with no forming or combs required. MERV graded to ASHRAE 52.2 test specs establishing particle filtration to the level of the original brand Ruud PD540020 filters. Notice: The example air filter picture displayed is not to scale and is there to show configuration only. Name brands and Ruud PD540020 identifier shown for filter replacement identification.