revolving door [ri′välv·iŋ ′dȯr]
An exterior door consisting of four leaves (at 90° to each other) which pivot about a common vertical axis within a cylindrically shaped vestibule; prevents the direct passage of air through the vestibule, thereby eliminating drafts from outside.
(building construction)
A door consisting of four leaves that revolve together on a central vertical axis within a circular vestibule.
revolving door
revolving door: plan
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