FC100A1037 Honeywell 20x25x5 MERV 10 Filter Media
20x25x5 (19.88x24.88x4.38) Original MERV 11 Honeywell Replacement filter20" X 25" X 4-3/8" (actual size 19 7/8" X 24 7/8" X 4 3/8")Fits Honeywell Series: F25,F35,F100,F150 Replaces FC35A1027, 203720