Air Curtains Allowed as Vestibule Substitutes in Upcoming ASHRAE Standard 90.1-2019

Doorway air curtains were approved June 25 as alternatives to vestibules on most commercial building entries in the upcoming ASHRAE Standard 90.1-2019 “Energy Standard for Buildings Except Low Rise Residential Buildings.” The professional association’s approved addition requires that the air curtain performance be tested in accordance with ANSI/AMCA Standard 220 to ensure it provides a minimum 400-ft/min. airstream velocity at the floor.