The Trane BAYFTAH26W1A is the correct pre-filter for the following enclosures:
The Trane Perfect Fit BAYFTAH26W1A Pre-filter 21x26x1 features a MERV 5 rating for the reduction of airborne particulates. This Trane Perfect Fit filter fits 26" enclosures and measures approximately 26" x 21" x 1". This Trane pre-filter is washable and also a slide-in media filter.
Trane Perfect Fit BAYFTAH26W1A Pre-filter 21x26x1 specifications: