20x20x5 air filters for your furnace, air conditioner, heat pump, or hvac system actual size (exact dimensions): 19.63 x 19.81 x 4.38 inches (1-pack) merv 13 electrostatic media (mpr 1900, fpr 10) protects against 98% of particles pleated design traps more airborne particles and lasts 3x longer than fiberglass all industrial-grade components are made in the usa and designed to be recycled compatible models: honeywell f25 (#203721), f35 / f35r (#fc35a1019), f100 / f150 (#fc100a1011), f200 (#fc200e1011), lennox (x0585, x8305, x8308), collection cells (f25f1018, f35f1016, f100f1020, f50a1124, f50a1165, f50e1026, f50e1182, f50e6124, f50e6165, f50e8021, f50e8062, f50f1107, f50f1040, f55a1244, f55a1426, f55a1459, f55f1029, f55f1052, f58a1050, f58f1026, f300e1027)
