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Crash bar doors in a school, with upper vertical rod latches. A crash bar (also known as a panic exit device, panic bar, or bump bar) [1] [2] is a type of door opening mechanism which allows users to open a door by pushing a bar.
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A swing door has special single-action hinges that allow it to open either outward or inward, and is usually sprung to keep it closed. French doors are derived from the French design called the casement door. It is a door with lites where all or some panels would be in a casement door.
Transom windows which could be opened to provide cross-ventilation while maintaining security and privacy (due to their small size and height above floor level) were a common feature of apartments, homes, office buildings, schools, and other buildings before central air conditioning and heating became common beginning in the early-to-mid 20th century.