On-Line Catalog : Fire Dampers > Dynamic - 3 hr > Airfoil Blade > FD-350
Model FD-350 3 hour — fire damper
The FD-350 fire damper employs airfoil blades for point-of-origin control of fire in static and dynamic HVAC systems. The FD-350 is qualified to 2,000 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.