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  2. Secret passage - Wikipedia

    en.wikipedia.org/wiki/Secret_passage

    The fortified doors and walls protect the occupants so they can summon help using a mobile or land-line phone. Doors and walls can be reinforced with steel, Kevlar, sound-proof or bullet-resistant fiberglass panels. The door to the safe room can be concealed by panels that match existing walls or doors in the home.

  3. Sally port - Wikipedia

    en.wikipedia.org/wiki/Sally_port

    When they are constructed for the passage of men only, they are made with steps at the entrance, and outlet. They are about six feet wide, and ⁠8 + 1 / 2 ⁠ feet high [1.8 m × 2.6 m]. There is also a gutter or shore made under the sallyports that are in the middle of the curtains, in order that the water which runs down the streets may pass ...

  4. Door - Wikipedia

    en.wikipedia.org/wiki/Door

    Most residential passage (room to room) doors are 30 in × 80 in (760 mm × 2,030 mm). A standard US residential (exterior) door size is 36 in × 80 in (910 mm × 2,030 mm). Interior doors for wheelchair access must also have a minimum width of 36 in (910 mm).

  5. Porte des Morts - Wikipedia

    en.wikipedia.org/wiki/Porte_des_Morts

    The strait is also a combination of three separate passageways. Plum Island and tiny Pilot Island are almost in the center of what is commonly considered Death's Door, and pose hazards. While the Porte des Morts Passage proper to the south of Plum Island is relatively hazard free, the Detroit Island Passage to the north of Plum Island has many.

  6. Glossary of architecture - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_architecture

    A passage or walkway covered over by a succession of arches or vaults supported by columns. Blind arcade or arcading: the same applied to the wall surface. Arch A curved structure capable of spanning a space while supporting significant weight. Architrave A formalized lintel, the lowest member of the classical entablature.

  7. Gangway connection - Wikipedia

    en.wikipedia.org/wiki/Gangway_connection

    Although a normal gangway connection was used, the passageway through the tender was only 5 feet (1.52 m) high and 18 inches (0.46 m) wide, and the floor of the passage was 2 feet (0.61 m) above the bottom of the water tank, requiring two steps at both ends.