Replacement Filters for Tranereg;. Tranereg; Perfect Fit air filter #BAYFTAH21M, TFM215A0AH00, c, TFM215B0AH01, and TFM215B0AH0A. Nominal size is 21 x 21 1/2 x 5. Actual size is 20.1 x 21.1 x 5. It has 98% efficient filtration media. Aftermarket replacement filter. Up to twenty times more effective than ordinary fiberglass filters. High-efficiency filter media collects small dust particles before they can collect on your coils. No assembly required…no combs needed…filter just slides right in! Each filter is individually bagged. Use the bag to dispose of the old filter! Package contains 2 filters. This is an aftermarket filter.