ASHRAE ‘s newly adopted 90.1-2019 addresses the main entryway of commercial buildings 3,000 ft2 & larger. Commercial building owners, architects, HVAC designers and contractors can now specify air curtains to satisfy code and reduce energy loss in commercial buildings provided that the air curtain has been tested and certified in accordance to ANSI/AMCA Standard 220, which requires a minimum air velocity of 400 fpm (2 m/s) at the floor, regardless of the mounting height.
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