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  2. Trapdoor - Wikipedia

    en.wikipedia.org/wiki/Trapdoor

    Deck hatch of the Omega, the last square-rigged sailing cargo ship. Originally, trapdoors were sack traps in mills, and allowed the sacks to pass up through the mill while naturally falling back to a closed position. [3] Many buildings with flat roofs have hatches that provide access to the roof.

  3. Fixed roof tank - Wikipedia

    en.wikipedia.org/wiki/Fixed_roof_tank

    Fixed roof tanks without breather valves will generally be freely vented; [2] thus the emissions from a fixed roof tank can be non-trivial. Gauge hatches, sample wells, float gauges, and roof manholes provide accessibility to these tanks, and also act as potential sources of volatile emissions.

  4. Manhole - Wikipedia

    en.wikipedia.org/wiki/Manhole

    Manhole closings are protected by a grating or manhole cover, a flat plug designed to prevent accidental or unauthorized access to the manhole. These covers are traditionally made of metal, [ 2 ] but may be constructed from precast concrete , glass reinforced plastic or other composite materials (especially where cover theft is of concern).

  5. South African Class 6E1, Series 11 - Wikipedia

    en.wikipedia.org/wiki/South_African_Class_6E1...

    A pantograph hook stick was stowed in a tube mounted below the lower edge of the locomotive body on the roof access ladder side. The locomotive had one square and two rectangular access panels along the lower half of the body and a large hatch door on the roof access ladder side, and only one square access panel and a large hatch door on the ...

  6. Attic - Wikipedia

    en.wikipedia.org/wiki/Attic

    Also, a building with a complex roof or many piercings between the conditioned area and the attic might control condensation better or more cheaply with an insulated roof and a vapor barrier. [ 5 ] One common code requirement is that the total area of attic vents be equal to or greater than 1/150 of the floor area of the attic, with 50 percent ...

  7. Type 89 AFV - Wikipedia

    en.wikipedia.org/wiki/Type_89_AFV

    A 12.7 millimetre calibre machine gun is located in an open mount at the front of a small hatch in the center of the hull which opens into the troop compartment. The gun can traverse through 360 degrees and can be elevated to an angle of 90 degrees. Two oblong roof hatches and a large rear door provide access to the troop compartment.

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