The FSDR25C is a round tunnel corridor fire/smoke damper with UL555 Classification as a 1 ½ hour rated fire damper and a Leakage Class I UL555S Smoke Damper.
It features:
1-1/2 hour rating.
EFL or PFL heat-actuated devices that permit closed closure through the actuator and are automatic remote resettable after test, smoke detection, or power failure conditions.
Galvanized steel construction.
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Specification
The FSDR25C is a round tunnel corridor fire/smoke damper with UL555 Classification as a 1 ½ hour rated fire damper and a Leakage Class I UL555S Smoke Damper.
It features:
1-1/2 hour rating.
EFL or PFL heat-actuated devices that permit closed closure through the actuator and are automatic remote resettable after test, smoke detection, or power failure conditions.