Replacement Filter for Rheem / Ruud RXHF-E21AM10 - 21' x 21' x 4-1/2' (actual dimensions 20-3/4' X 20-3/4' X 4-3/8') - Rated MERV 11 Replaces media filters used in Rheem / Ruud model RXHF-E21AM10 21' Air Handler Media Air Cleaner Cabinets.  Replaces Protech 540012, will also replace 540042, PD540042. NOTE: This filter is not manufacturered by Rheem or Ruud. These deep-pleated filters are manufactured to fit in Rheem and Ruud Media Exact Fit Air Cleaners. Expect comparable quality of construction at a value price!! The OEM filters are typically rated at MERV 10 - but these filters are rated at MERV 11. FEATURES:  Moisture resistant frame remains sturdy even in high humidity Rust resistant galvanized wire downstream gives the filter rigidity and holds media in place after installation  Built-in support fingers hold pleats in place and allow for maximum dust holding Â
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