Filtrete 16x25x5 AC Furnace Air Filter, MPR 1550, MERV 12, Fit Trion Air Bear Furnace, Allergen, Bacteria & Virus, Electrostatic Air Cleaning Filter, 1-Pack (actual size 15.75 x 24.13 x 4.88)Actual filter size is: 15. 75 in x 24. 125 in x 4. 875 in This filter is compatible with TrionAirBear furnaces calling for a 5" filter #1 Recommended Brand* (*Filtrete Brand is the most recommended brand of HVAC Air Filters based on the US Filtrete Brand Health Tracker, Ipsos, June 2022) 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