FilterBuy 17.5x27x5 Trane Perfect Fit BAYFTFR17M Compatible Pleated AC Furnace Air Filters (Pack of 2). AFB Silver MERV 8. 17.5x27x5 Trane Perfect Fit BAYFTFR17M Furnace Filter / Air Filter - AFB Silver (Merv 8). (2 Pack) Specifically designed by AFB to replace Trane Perfect Fit BAYFTFR17M filters Removes lint & dust, dust mite debris Pack of 2 Filters Merv Rating of 8