The space between two sets of exit doors meant to prevent heat from escaping is called what?A vestibule?

Question

Resturants, hotels, stores, etc. have a small space between two sets of exit doors to keep the cold air from escaping in the summer and heat from escaping in the winter. Some restaurants have temporary vestibules in the winter. What is this space called? What are the temporary structures called that create such a space (commonly seen in New York City restaurants)?

Answer 1

Vestibule: a passage way acting as an airlock between two environments.
Have a look at this...

http://www.newyorker.com/printables/talk/050103ta_talk_parker

Answer 2

It is called a Vestibule in everyday language.
However vestibules also connect trains and buses in order to allow people to pass through them
In the space between two sets of exit doors of a hotel, space shuttle or a container Unit the air is vaccumised ie it is filled with vaccum in order to prevent heat from escaping.
For example, A Thermos flask also has the above concept. There is vaccum in the space between the exit points that prevent heat from being conducted and escaping from the unit

Answer 3

They may be called some thing else but Vestibule is a good one.

Answer 4

<>A vestibule is one term for it. It can also be called antechamber, or even lobby.