Combination Fire/Smoke Dampers function as both a fire damper and a smoke damper in a single unit. HVAC system designers often combine smoke barriers and fire rated partitions, requiring both a fire damper and a smoke damper to be installed in the same location. A combination Fire/Smoke damper is recommended in this situation.
Lau Fire/Smoke dampers meet the requirements of both UL Standards 555 (fire dampers) and 555S (smoke dampers).
All combination Fire/Smoke dampers require factory installed actuators, either electric or pneumatic. They are controlled by a smoke or heat detector signal, fire alarm or other building control system to prevent the spread of smoke. Manual or automatic override allows the damper to be used as part of an engineered smoke control system. When temperatures exceed the closure temperature of the damper, the blades close and lock to protect the integrity of the fire rated partition. Lau Fire/Smoke dampers are always supplied with the appropriate factory-mounted actuator and UL label.