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Numerous devices exist to serve specific purposes related to how a door should (or should not) be used. See: Door chain - A device to secure door opening; Door closer – Mechanical or electromagnetic device to close an open door (in the event of a fire) [3] Door opener - Automatic door opening device activated by motion sensors or pressure pads
A bifold door is a unit that has several sections, folding in pairs. Wood is the most common material, and doors may also be metal or glass. Bifolds are most commonly made for closets, but may also be used as units between rooms. Bi-fold doors are essentially now doors that let the outside in.
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The doors, measuring 4.45 metres (14.6 ft) wide and 7.53 metres (24.7 ft) high, consist of two leaves. [2] The panels and lintels of the doors are made of cast bronze. Each leaf pivots on pins installed in the floor at the bottom and in the architrave at the top. [3]
The westwork of Hildesheim Cathedral in 2005. Each leaf of the doors was cast as a single piece. Given the size (left: 472.0 x 125.0 cm, right: 472.0 x 114.5 cm, maximum thickness c. 3.5-4.5 cm) and enormous weight (both c. 1.85 tonnes) of the doors, this is a great achievement for its time.