BestAir PFHW1625-11CR Furnace Filter, 16" x 25" x 4", Carbon Infused Pet Filter, MERV 11 Fits Trion Air Bear Model 435790 Fits Honeywell Model 203719 Lasts up to 12 Months Filters airborne particles that can trigger Allergy and Asthma attacks Absorbs extreme odors in your home