21x21x5 Rheem/Ruud Protech 540012 Air Filter

Product Description
This 21x21x5 Rheem/Ruud (Protech 540012) substitute air filters are specifically designed to replace the original brand Rheem/Ruud 21x21x5 air filters. Filter Hut filters are MERV tested to ASHRAE 52.2 test standards ensuring that our filters will capture debris as good or better than the original brand part number (Protech 540012) filters. Our filters also come in Odor Ban odor filtering carbon-infused material. *Trade names are used for filter style 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.
  • Accumulair Envaero brand.
  • Engineered to substitute for the original manufacturer filter.
  • Filters framed and preassembled for ease of intallation. (Non-expandable, no end caps needed, etc.)
  • MERV classified to ASHRAE grades.
  • Available with Odor Ban odor filtrating carbon properties.
  • 2 filters per case.
Quantity of Filters in Case
Efficiency Rating
Quantity of Cases
$ 62.90 per case