BHMA A156-24:2018 pdf download.STANDARD FOR DELAYED EGRESS LOCKING SYSTEMS
3.GENERAL
3.1 When a force, not to exceed 15 Ibf (67 N), is continuously applied on the door or release device, for no more than three seconds, an irreversible process shall be initiated. That irreversible process will allow the door to be opened after that period. An audible signal shall be activated in the vicinity of the door equipped with the delayed egress locking system, to indicate to the user of the door that the system is operative.
3.2 Delayed egress locking systems are subject to building, fire, and life safety code requirements. Consult applicable codes for values in effect for nuisance delay duration release delay duration and other specific requirements.
3.3 Some codes require that when a door equipped with a delayed egress locking system is opened during unauthorized egress, the delay feature must be reset manually at the door when the door closes.
3.4 The releasing mechanism of delayed egress locking systems shall require only one motion to initiate the irreversible process of opening, and the method of operation shall be obvious in all lighting conditions.
3.5 Upon loss of power, the time delay feature shall become inoperative and the lock shall allow egress without the delay. Battery back-up systems where permitted, shall not interfere with required emergency release systems.
3.6 Force to operate latch releasing trim shall be in compliance with the respective BHMA A156 series hardware standard.
3.7 Exit devices, locks or auxiliary locks equipped with a delayed egress feature shall meet the requirements of ANSI/BHMA Standards A 156.2-2017 for Bored and Pre-assembled Locks and Latches, Al56.3-2014 for Exit Devices, ANSI/BHMA Al56.13-2017 for Mortise Locks, A156.23-2017 for Electromagnetic Locks or Al56.36-2016 for Auxiliary Locks, as applicable. Component manufacturers using locks or exit devices made by others are permitted to qualify their delayed egress system by testing with a single manufacturer’s lock. Upon qualification, any manufacturer’s lock of the same type, and providing it meets the applicable ANSI/BHMA Standard, may be used.
3.8 American National Standards referenced in this Standard are available from the American National Standards Institute www .ansi.com www.buildershardware.com.
3.9 Delayed egress locking systems shall meet the requirements of the applicable clauses of UL Standard 294 as agreed upon by the Nationally Recognized Testing Laboratory (NRTL) and the manufacturer. The delayed egress locking system shall be so listed or labeled by the NRTL and be under the follow-up inspection service of the certifying laboratory.BHMA A156-24 pdf download.