Filtrete 20x25x4 AC Furnace Air Filter, MPR 1000 MERV 11, Allergen Defense, 4-Pack, Fits Lennox & Honeywell Devices Actual Dimensions 19.88 x 24.63 x 4.31, 4 Count

Actual filter size is: 19.875 in x 24.625 in x 4.31 in This filter is compatible with Honeywell furnaces calling for a 4" filter, and Lennox furnaces calling for a 5" filter The higher the MPR, the more microparticles--such as pollen, pet dander, smoke, bacteria and viruses--your filter will capture from the air passing through it FOR OPTIMAL PERFORMANCE of your heating & cooling system or HVAC system, change your home air filter at least every 12 months for 4 in. and 5 in. filters A dirty filter will slow down air flow and make the system work harder to keep you warm or cool--wasting energy. Sign-up for a filter change reminder program www.filtrete.com/ChangeReminders that works for you! OUTPERFORMS FIBERGLASS, WASHABLE AND NON-ELECTROSTATIC 3-month pleated 1 in. home air filters for your furnace, air conditioner or HVAC system DESIGNED WITH EXCLUSIVE Filtrete Brand 3-in-1 technology from 3M to trap unwanted air particles while letting cleaner air flow through