The requirements of 5.4.3.4 (ASHRAE 90.1-2007) are very strict. My team is trying to certify a shopping mall with many shops opening directly to the outside. According to ASHRAE there is a requirement for many of the shops to install a vestibule or a revolving door.
The building owner is not willing to install such equipment and asks instead of installing air curtains.
There are some papers describing, that air curtains can be better than vestibules.
Does anyone of you have experience on using air curtains instead of vestibules in a LEED v3 Project?
Thank you very much.