While originally conceived as a way to prevent crowd crushing in an emergency crash bars are now used as the primary door opening mechanism in many commercial buildings.
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A crash bar is a type of door opening mechanism which allows users to open a door by pushing a bar.
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Nfpa standard 101 does state that the push pad on a panic bar must cover at least half of the door.
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Door push bars building codes essentially state that egress through access controlled doors must not require prior knowledge of operational requirements.
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Depressing the bar unlatches the door allowing occupants to quickly leave the building.
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When slight pressure is applied to the non latching bar pressure sensors are actuated causing the electronics to immediately release the electromagnetic door locks.
The majority of panic bars can be cut to fit most doors though the push pad itself cannot be altered.
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The device consists of a spring loaded metal bar which is fixed horizontally to a door that swings in the direction of an exit.
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This allows for invisible wiring to the mortise lock.
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On a typical 36 door the push pad must be at least 18 long.
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