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Possible Duplicate:
Does air pressure equalize more quickly if the doors are open?

If two rooms, or a room and space, are connected by two doors, does it make a difference whether I open one or both of the doors?

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Yes. When I did my analysis of oxygen flow between rooms, I had a situation where opening a second door caused a change in the steady-state of oxygen.

Oxygen equalizes at a rate proportional to the difference between two rooms, at each door. So with two doors open it will equalize faster.

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