Honeywell factory original, OEM FC100A1011 Pleated Filter, 20" x 20" x 4", MERV 11, 2 pack<div> </div>Convenient 2 pack of factory original, OEM replacement filters for the Whole House Electronic Air Cleaner F200, F100, F150, F35, F25, F27. <div> </div>Replace the filter every 6 to 12 months. <div> </div>Filter measures 20" x 20" x 4" <div> </div>Since 1885 Honeywell has been providing customers with cutting-edge technology in the home comfort industry. From the first thermostat to today's innovative Indoor Air Quality products, Honeywell continues to be a leader in the home comfort market.