Nordic Pure 20x25x4/20x25x5 (19 7/8 x 24 7/8 x 4 3/8) Honeywell FC100A1037 Replacement Pleated AC Furnace Air Filters MERV 12, Box of 2 Nominal Size: 20-Inch by 25-Inch by 5-Inch Actual Size: 19 7/8 x 24 7/8 x 4 3/8 Nordic Pure brand replacements for Honeywell units Replacements for Honeywell 203720, FC35A1027, FC100A1037 and FC200E1037 MERV 12 filter media to help reduce pollen, pet dander, dust, mold and more