Delayed egress locking systems are permitted on doors serving any occupancy except which of the following?

Delayed egress locking systems are designed to enhance security while allowing for a quick exit in case of emergencies. These systems are generally permitted in various occupancy types, as they provide a balance between egress needs and security measures. However, there are specific regulations regarding their use depending on the occupancy group.

In the case of Group A occupancies, which include assembly areas where large crowds gather, such as theaters, auditoriums, or venues for public gathering, the use of delayed egress locking systems is limited due to the potential risk posed in emergencies. The safety of the occupants is a paramount concern; in these settings, swift evacuation can be crucial. Consequently, the code restricts the use of delayed egress systems in Group A occupancies to ensure a clear and immediate means of egress without delay.

The other occupancy groups listed—B (Business), S (Storage), and U (Utility)—have different safety considerations and architectural contexts where delayed egress locking systems are typically deemed acceptable. These groups are less likely to present scenarios where large crowds must exit rapidly during emergencies, making the risks associated with delayed egress systems manageable under certain conditions.