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The Trane BAYFTFR21W1A is a pre-filter for use in the following furnace:
The Trane Perfect Fit BAYFTFR21W1A Pre-filter 21x27x1 has a nominal size of 21 inches x 27 inches x 1 inch. The actual size of this Trane pre-filter is 20.7 inches x 26.2 inches x 7/8 inch. This Trane perfect fit filter comes as two filters that measure approximately 12 7/8 inches x 20 3/4 inches each. This Trane air filter is a slide in media filter that can be washed and re-used.
The Trane BAYFTFR21W1A specifications: