Section 10.4.5 of the ASHRAE 90.1 vestibule exception standard sets the criteria for approved vestibule exception air curtains. The results show that air curtains, in fact save more energy than vestibules.” They have also compared it to the energy savings and losses of vestibules. For more than 6 years Concordia University researchers have been studying air curtain energy usage and savings.

The energy savings that air curtains provide has been thoroughly documented in the extensive research conducted by Concordia University. “Air curtains have been installed in buildings for over 60 years. As per the forward of its Public Review Draft, the addendum to ASHRAE 90.1 Energy reports that: This is a much anticipated move for the robust air curtain industry, which touts energy savings, climate control, comfort and the capability to repel flying insects as its hallmark. Gren Yuill, an authority on air infiltration into vestibules and through automatic doors. Liangzhu (Leon) Wang, an expert in energy simulation and airflow modeling, and project review by Dr. Analysis included three comprehensive studies conducted Dr. This approval by ASHRAE follows an intense examination of the effectiveness of air curtains commissioned by the Air Movement and Control Association (AMCA) International in coordination with Concordia University. Self closing doors in buildings 15 stories or less in Climate Zones 5 thru 8 that have an air curtain complying with Section 10.4.5.Self closing doors in buildings in Climate Zones 0, 3, and 4 that have an air curtain complying with Section 10.4.5.It spells out previously approved exceptions to the vestibule requirement, but adds two provisions regarding the use of air curtains. The ASHRAE version mirrors but is not identical to the IECC. However many states continued to defer to ASHRAE 90.1. It is similar to the guidelines first established by the International Code Council (ICC), effective with its 2015 International Energy Conservation Code (IECC). This new standard is effective with the 2019 edition of ASHRAE/IES Standard 90.1-2019, Energy Standard for Buildings Except Low-Rise Residential Buildings.

ASHRAE Approves Air Curtains in New RulingĪSHRAE, the leading policy-maker for the heating, refrigeration and air-conditioning industry has formally approved the use of properly certified and installed air curtains as an exception to the vestibule requirement.

Ashrae 90.1 2015