FSD-EX UL Classified 1 1/2 hr. Class I

The FSD-EX Combination Fire/Smoke Round Damper is both UL555 and UL555S Classified. It is rated as a 1-1/2 hour fire damper and a Leakage Class I Smoke damper. It features:

Rated to 2,000 fpm and 4" w.g.
UL approval for dual directional airflow.
Two-piece 14 gage (1.9) equivalent blade thickness galvanized steel sandwiches insulation.
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 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