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2. Trapdoor - Wikipedia

   en.wikipedia.org/wiki/Trapdoor

   A trapdoor or hatch is a sliding or hinged door that is flush with the surface of a floor, ceiling, or roof. [1] It is traditionally small in size. [2] It was invented to facilitate the hoisting of grain up through mills, however, its list of uses has grown over time. [3]

3. Vestibule (architecture) - Wikipedia

   en.wikipedia.org/wiki/Vestibule_(architecture)

   A floor plan with a modern vestibule shown in red. A vestibule (also anteroom, antechamber, air-lock entry or foyer) is a small room leading into a larger space [1] such as a lobby, entrance hall, or passage, for the purpose of waiting, withholding the larger space from view, reducing heat loss, providing storage space for outdoor clothing, etc.

4. Mantrap (access control) - Wikipedia

   en.wikipedia.org/wiki/Mantrap_(access_control)

   Entrance to HM Prison Edinburgh. A mantrap, security mantrap portal, airlock, sally port or access control vestibule is a physical security access control system comprising a small space with two sets of interlocking doors, such that the first set of doors must close before the second set opens.

5. Door - Wikipedia

   en.wikipedia.org/wiki/Door

   A door. A door is a hinged or otherwise movable barrier that allows ingress (entry) into and egress (exit) from an enclosure. The created opening in the wall is a doorway or portal. A door's essential and primary purpose is to provide security by controlling access to the doorway (portal).

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   AOL latest headlines, news articles on business, entertainment, health and world events.

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