FilterBuy 17.5x27x5 Trane Perfect Fit BAYFTFR17M Compatible Pleated AC Furnace Air Filters (Pack of 2). AFB Gold MERV 11. 17.5x27x5 Trane Perfect Fit BAYFTFR17M Furnace Filter / Air Filter - AFB Gold (Merv 11). (2 Pack) Specifically designed by AFB to replace Trane Perfect Fit BAYFTFR17M filters Removes lint & dust, dust mite debris, great for allergies Pack of 2 Filters Merv Rating of 11