The FSD60 Combination Fire/Smoke Damper are both UL555 and UL555S Classified, and rated as a 1-1/2 hour fire damper and a Leakage Class I Smoke damper. It features:
Maximum velocity of 4,000 fpm.
Maximum 8″ static pressure
UL approval for dual directional airflow
Failsafe design, which enables the damper to automatically assume the desired position when fire or smoke (if smoke detector is present) interrupts operational power
The EFL or PFL heat-actuated release devices permit controlled closure through the actuator and are automatically remote re-settable after test, smoke detection, or power failure conditions
