Doorway air curtains were approved June 2019 as alternatives to vestibules on most commercial building entries in the upcoming ASHRAE Standard 90.1-2019 “Energy Standard for Buildings Except Low Rise ...

M.B. A. If you can create an opening under the vestibule, it may be possible to get spray-foam insulation under there. There are lumber yards that sell small spray foam kits, larger than the small ...

Among the many tactics, secure entry vestibules are a commonly recommended measure that helps defend schools against violent intruders. What are secure entry vestibules and how do they support safer ...