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File talk:World Trade Center Building Design with Floor and Elevator Arrangment.svg Metadata This file contains additional information, probably added from the digital camera or scanner used to create or digitize it.
However, traction elevators still require additional space above the elevator roof to accommodate the components required to raise and lower the car. Shaftless home lifts consist of a rectangular elevator cabin positioned on a rail. The lift travels on the route from the lower floor to the upper floor and back.
Small, targeted clean agent automatic extinguishing systems are sometimes installed in these areas. Fire protection of an escalator floor opening is also sometimes provided by adding automatic sprinklers or fireproof shutters to the opening, or by installing the escalator in an enclosed fire-protected space.
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They moved at an average speed of 1,200 feet per minute (370 m/min) and made up 13% of the building's entire construction cost. [13] One elevator reached a top speed of 1,400 feet per minute (430 m/min) and was dubbed "the fastest passenger elevator ride on record". [14] These elevators cost about $17,000 a year to maintain by 1942. [15]
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