FSD37 1-1/2 hr V-Groove Blade Combination Fire/Smoke Damper

The FSD37 Combination Fire/Smoke Damper is 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 2,000 fpm.
• Maximum 4" static pressure. 
• UL tested 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.