US Home Filter SC40-20X25X4.375 MERV 8 Honeywell Replacement Filter (Pack of 2), 20" x 25" x 4-3/8" Actual Size: 20" x 24-7/8" x 4-5/16" Replaces: Honeywell 20x25 and Filtrete 20x25x4 Ideal for normal air filtration and those with mild allergies MERV 8 tested under ASHRAE 52.2-2007 standards Galvanized expanded metal backing