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Why won a vestibule space between interior and exterior swing doors prevent drafts?

April 26, 2017doors drafts exterior interior swing vestibule

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Why won a vestibule space between interior and exterior swing doors prevent drafts?

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A. If traffic is light enough so one of the sets of doors remains closed, a swing door vestibule will prevent drafts. However, when both sets of doors are held open at the same time – as is the case when traffic is heavy – there will be no barrier against drafts.