New ASHRAE Standard Will Allow Air Curtains as Vestibule Substitutes

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.