3 Hour - Dynamic Rated - Fire Damper
Installation Instructions
The FD4D-3A fire damper employs curtain style blades for point-of-origin control of fire in static and dynamic HVAC systems. The FD4D-3A is qualified to 4,000 ft/min (20.3 m/s) and 4 in.wg. (1.0 kPa) and may be installed in vertical walls or partitions with fire resistance ratings up to 2 hours.
Frame: 22 ga. (0.85) galvanized steel.
Blades: 24 ga. (0.7) galvanized steel - curtain.
Fire Closure Device: Fusible link.
Fire Closure Temperature: 165oF (75oC)
Minimum Size: 6" x 6" (152 x 152)
Maximum Size: 36" x 36" (914 x 914)
Multiple Section: 108" x 24" (2743 x 810)
Stainless Steel: Single Section: 36" x 24" (914 x 610)
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