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.

The replacement filter is a high-efficiency. long-life filter for Perfect Fit media air cleaners. It captures a significant amount of airborne particles in the air that circulates through the filter. This is a Genuine Trane / American Standard OEM Filter 21"x27"x5" OEM Media Filter Replacement for Trane/American Standard 21" furnace enclosure.