20x25x5 MERV 13 Honeywell Replacement Filter (2 Pack) MERV 13 Static Pressure Drop (in w.c.): 0.31 Used with Honeywell 20x25 F100 and F200 Media Air Cleaners and Aprilaire Media Air Cleaners 2 pack of factory original Honeywell Filters Nominal filter size: 20" x 25" x 4"