Filter Hut's 21x21x5 Rheem/Ruud (Protech 540012) compatible air filters are specifically designed to replace the original brand Rheem/Ruud 21x21x5 filters. Filter Hut's air filters are MERV tested to ASHRAE 52.2 test classifications assuring that our filters will operate as good or better than the OEM part number (Protech 540012) air filters. These air filters also come in Odor Ban odor isolating carbon-infused media. *Trade names are listed 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: Protech 540012.
- Quality Filters Envaero brand.
- Engineered to replace the name brand filter.
- Filters framed and preassembled for ease of intallation. (No need for extra combs, end-caps, etc.)
MERV tested to ASHRAE grades.
- Option of Odor Ban odor filtrating carbon material.
- 2 air filters per case.