Classification: UNCLASSIFIED
Caveats: NONE

An interesting variable for a vestibule is the frequency of use.

How do you model a vestibule for a shopping center with a nearly continuous stream of people entering and exiting compared to a vestibule for an office building where the traffic is very low.

I was designing an HVAC system for a 600 sqft guard office in a cold climate. I couldn't find much information on how to model (or design) the system to account for the extremely frequent opening and closing of the door.