The FSD35G Combination Fire/Smoke Damper is both UL555 and UL555S Classified. It is rated as a 1-1/2 hour fire damper and a Leakage Class III Smoke damper. It features:
- Factory designed to accept a 1 3/4" grille and 3/4" front flange shipped loose.
- Triple V-Groove Blades.
- Rated to 2,000 fpm and 4" w.g.
- 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 resettable after test, smoke detection, or power failure conditions.
- Galvanized steel construction.
Note: Consult Ruskin if wall is less than 6" thick.
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