BestAir® is dedicated to providing a clean and comfortable indoor environment for everyone. We have a complete array of high quality humidification wicks, air cleaning filters, and many other accessories, which will ensure that your indoor air quality will be the BestAir® that you and your family can breathe.This BestAir MERV 13 furnace filter has a 20x25x4 frame and traps up to 99% of airborne particles from 0.3 to 10.0 microns in size. It helps filter out pet dander, dust mite debris, most smoke and other unhealthy particles. This item includes 3 furnace air filters. You should change your furnace filter like this one, every 6-12 months.Measures 20" x 25" x 4"; Actual Size: 19 3/4" x 24 3/4" x 4 1/4"This furnace filter fits Honeywell Air Cleaner Models: F100B1032, F100B1040, F100F1087, F100F1095, F100F2044, F100F2051, F200E1037, 203720, F35/35R FC35A1027, F100/150 FC100A1037, F200 FC200E1037, CF100A1025, CF100A1058, FC100A1037, FC200E1037, POPUP2025