The Trane BAYFTFR17W1A is the correct replacement filter for the following air cleaner models:
The Trane Perfect Fit BAYFTFR17W1A Prefilter 17.5x27x1 is a washable filter with a MERV 5 rating that needs to be changed every 3 months for maximum efficiency. This Trane pre-filter includes two filters that measure approximately 12 7/8" x 17 1/4" (17.5" x 27" x 1" combined), is used with 17.5" enclosures, and fits several media and electronic air cleaner models from Trane. This slide-in Trane Perfect Fit filter can be washed and reused for your convenience.
Trane Perfect Fit BAYFTFR17W1A Prefilter 17.5x27x1 specifications: