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Delayed egress doors are one of the most commonly-used features in design situations where some level of access control is needed on the path of egress. Under normal conditions, delayed-egress doors are a deterrent to building occupants, limiting access through the door unless necessary for an emergency. During an emergency, the delay function will deactivate (whether upon loss of power, or sprinkler/fire alarm activation), effectively making the door a normal egress door.
Similar to the other cheatsheets I have put together, this one is motivated by numerous architect requests for clarification as to when a delayed egress door can be provided.
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