On-Line Catalog : Fire-Smoke Dampers > 3 Hour Rated > Airfoil Blade > FSD-351
Model FSD-351 3 hour • UL class 1 — combination fire smoke damper
The FSD-351 combination fire smoke damper employs airfoil blades for point-of-origin control of fire and smoke in static and dynamic smoke management systems. The FSD-351 is qualified to 4,000 ft/min (10.2 m/s) and 4 in.wg. (1.0 kPa) and may be installed horizontally in floors or assemblies with fire resistance ratings up to 4 hours.