Trane/American Standard PERFECT FIT Filter 21X27X5 - BAYFTFR21M/FLR06070 Trane Perfect Fit air filter #BAYFRAME21A, BAYFTFR21M, TFM210B0FR0, TFM210A0FR00, TFM210A0FR10,TFM210B0FR01, TFM210B0FR0A, and TFM21DA0FR00 Nominal size 21" x 27" x 5" Actual Size 20.7" x 26.2" x 5" 98% efficient filtration media Easy installation. Angled edge fits neatly into offset side of air cleaner frame.