Trane and American Standard 21.5x21x5 Perfect Fit Media Filter (FLR06072/BAYFTAH21M) (2 Pack) Higher efficiency and lower pressure drop than OEM filter. Captures particles as small as 0.3 microns. Pleated filter for greater media capacity. Low pressure drop reduces strain on equipment, provides a comfortable air flow Easy installation. Angled edge fits neatly into offset side of air cleaner frame.