Honeywell 18" x 20" x 1" Furnace Filter Cardboard Frame - 12 pack
Media replacement cartridge, for furnaces with filter cavities approximately sized 18 inches x 20 inches x 1 inches.
Actual measurements of filter: 17.5 inches by 19.5 inches by 0.75 inches.
Filter may be smaller than cavity to account for installation differences, but the size will not reduce the filter's effectiveness.
MERV 8 rating.
Fits most Honeywell, Carrier, and Lennox furnaces.
Original part number; SC40-18X20X1, 18x20x1, 80055.012020, 12020BPFTPR, S77P.