Honeywell FC100A1037-2 Replacement Media, 20" x 25" (Pack of 2) merv 11 20X25 Media Air Filter-MERV 11 Replacement Filter Honeywell 20X25, 25X20, 25X22 F100 and F200 Media Air Cleaners, SpaceGard 2200 The dimensions are 20 inch x 25 inch x4 inch