Trane TRANE-FLR06069 American Standard Perfect Fit Air Filter (BAYFTFR17M), 17.5 x 27 x 5" perfect fit air filter (BAYFTFR17M) Captures particles as small as 0.3 microns. Higher efficiency and lower pressure drop than oem filter. Pleated filter for greater media capacity. Easy installation. Angled edge fits neatly into offset side of air cleaner frame.