Filter Hut 21x21x5 Rheem/Ruud (PD540012) replacement filters are specifically designed to substitue for the original brand Rheem/Ruud 21x21x5 filters. Our filters are MERV graded to ASHRAE 52.2 test grades establishing that our air filters will perform as good or better than the name brand part number (PD540012) filter. These filters are available in Odor Ban odor filtering carbon-infused material. *Name brands are used for air filter replacement identification purposes only.
- 21 x 21 x 4.5 nominal size.
- 20-3/4 x 20-3/4 x 4-3/8 actual size.
- Replaces Rheem/Ruud brand 21x21x5 part number: PD540012.
- Accumulair Envaero brand.
- Designed to replace the name brand filter.
- Preassembled in frame for ease of installation. (No need for extra combs, end-caps, etc.)
MERV classified to ASHRAE ratings.
- Available in Odor Ban odor eliminating carbon properties.
- 2 filters to a case.