I have a question concerning the the function of a elevator lobby as a vestibule.
Regarding to Standard 90.1, every building entrance that separate cond. space from the exterior has to have an enclosed vestibule.

The question now is: Does a lift lobby function as an Standard 90.1-accepted vestibule if the door from the lobby to the exterior fulfills the mandatory door requirements and also the additional interior doors from the lobby to other building areas fulfill the requirements? Are there also requirments on the elevator door itself (air leakage, etc.)?