Honeywell FC100A1011 Media GENUINE OEM 2-Pack Special Honeywell factory original, OEM FC100A1011 Pleated Filter, 20" x 20" x 4", MERV 11 Static Pressure Drop (in w.c.): 0.24 Used with Honeywell 20x20 F100 and F200 Media Air Cleaners Nominal filter size: 20" x 20" x 4" Actual filter size: 19 7/8" x 19 7/8" x 4 3/8" 2 pack of Honeywell factory original OEM filters