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Because it allows less air to move out of the building into the environment at any given time. If you open a door to walk in and it lead directly into the building you allow a large amount of air exchange to occur. However if you add another door and close the first door first (typlically accomplished in commercial structures with automatic door closers) the only air movement to the outside is the volume of air already in that area. Like an air lock.

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13y ago

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