Filterbuy 21x21x5 Air Filters, AC Furnace Replacement for Rheem & Ruud (MERV 13)
—The Filterbuy replacement air filter 21x21x5 (actual measurements: 20.63″ x 20.63″ x 4.38″) ensures that your Whole House system is circulating clean air to help preserve your budget and healthy lifestyle. —Compatible Models: Rheem / Ruud Filter Part Number (PD540018), Protech (540012, 540018, PD540012), Housing Part Numbers (RXFH-E21AM10, RXFH-E21AM13). —MERV 13 synthetic media protects homes by trapping 98% of airborne particles. —Our electrostatically charged design features 12 pleats per foot and lasts 3x longer than fiberglass models by capturing more harmful particles. —Industrial-grade beverage board frames with dual wire backings outperform standard cardboard compositions by enduring heat up to 200° F and withstanding exposure to moisture.