US Home Filter SC80-20X25X6 MERV 13 Pleated Air Filter (Pack of 1), 20" x 25" x 6" Actual Size: 19-3/4" x 24-1/4" x 6" Replaces: Space-Guard & Aprilaire 201, 2200, 2250 Lennox & Healthy Climate X0445, X4560, X5424 & PMAC20C Ideal for those with moderate to severe allergies MERV 13 tested under ASHRAE 52.2-2007 standards Galvanized expanded metal backing