Abstract
When an outside door is opened the wind blows into a building, the rate at which air enters is limited by the fact that it has to leave again as part of the exfiltration. This simple truth is the basis of a method of calculating the rate at which air enters the building, and how long it takes to reach a steady state, given the area of the door, the volume of the building, and the air change rate caused by infiltration, when the door is shut. Resulting heat losses are unacceptably high, but not as high as claimed by door manufacturers.
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