In high occupancy buildings like those it s a requirement that any exit hardware incorporating delayed egress must have a sign that is located above the door and within twelve inches of the existing hardware.
Delayed egress door signage.
Delayed egress is a huge help in deterring theft in big box stores restaurants and other retail facilities just to name a few.
This causes the audible alarm to immediately sound but does not unlock the door.
But the international building code ibc specifies that the signage must be located on the door and within 12 inches of the egress hardware.
Delayed egress hardware prevents a door from being opened from the egress side usually for a period of 15 seconds.
The ibc only allows a single door equipped with delayed egress in a required egress path to exit the building.
In security environments where it is desired that a credential be used for passage in both directions a delayed egress lock will allow locking of the door encouraging the use of a credential without potentially trapping individuals if there is a legitimate reason for them to exit.
Paddle and bar activated deadlatches sound an alarm that continues until a key resets it.
However there is an exception for group i 2 and i 3 occupancies to allow a maximum of two delayed egress doors provided that the combined time delay is a maximum of 30 seconds.
A delayed egress lock will prevent egress for 15 seconds or 30 seconds when approved by the ahj when initiated by a 15 pound force initiation shall activate an audible signal in the vicinity of the door once the door has been released relocking shall be by manual means only.
Nfpa 101 the life safety code requires delayed egress signage to be mounted on the door leaf adjacent to the release device on the egress side of the door.
Automatic door delayed egress signs with one inch tactile letters and grade 2 domed braille ifc ada compliant 12 x 12 this title 24 and ada compliant delayed egress signs for automated door systems with tactile text and grade 2 braille can be made with 15 second to 60 seconds delay times or you can specify the exact time delay you need.
This type of device is often used to prevent theft while maintaining life safety.
The delayed egress locking system operates as follows.