Or crash bar is a type of door opening mechanism that allows to open a door by pushing a bar. In the event emergency exits are required, the crash bar works efficiently to allow people to pass through security doors without a reduction in speed. A crash bar's fast-acting mechanism reduces the risk that a rushing crowd might suddenly become a logjam at the exits. 

The device consists of a spring-loaded metal bar which is fixed horizontally to a door that swings in the direction of an exit. When the bar is depressed, it activates a mechanism which unlatches the door, allowing occupants to quickly leave the building.

Modern fire standards often mandate that doors be fitted with crash bars in commercial and other occupancies where mass evacuation may be slowed by other types of door openers.

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