These 21x24x5 Rheem/Ruud (PD540020) compatible filters are specifically built to substitue for the original brand Rheem/Ruud 21x24x5 air filters. Our air filters are MERV graded to ASHRAE 52.2 test grades ensuring that our filters will capture debris as good or better than the original brand part number (PD540020) air filters. These air filters can be selected with Odor Ban odor isolating carbon material. *Company names are listed for air filter style identification purposes only.
- 21 x 24.5 x 4. 5 nominal size.
- 20-3/4 x 24-1/4 x 4-3/8 actual size.
- Replaces Rheem/Ruud brand 21x24x5 part number: PD540020.
- Envaero brand by Accumulair.
- Specifically designed to substitute for the name brand filter.
- Preassembled in frame for ease of installation. (No end caps needed, don't need expanded with combs, etc.)
MERV tested to ASHRAE grades.
- Option of Odor Ban odor isolating carbon-infused media.
- 2 filters to a case.