What is a primary purpose of a blast door or barrier in egress design?

• A. To limit the propagation of blast and fragmentation, protecting egress paths and adjacent areas.
• B. To decorate the facility's entrance.
• C. To trap personnel for drills.
• D. To reduce lighting in the corridor.

Answer: (A)

The primary purpose of a blast door or barrier in egress design is to limit the propagation of blast and fragmentation, protecting egress paths and adjacent areas. By withstanding blast loads and containing debris, it helps keep corridors usable and reduces secondary injuries, giving occupants a safer route to exit and providing time for emergency response. Decorative features, trapping people during drills, or reducing corridor lighting don’t serve the safety and evacuation goals of the design, so they aren’t appropriate purposes. This concept underscores why blast doors are placed in safety-critical paths where occupants must evacuate under blast conditions.