Model FD-350

3 Hour - Fire Damper
Airfoil Blade

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 4,000 ft/min (20.3 m/s) and 6 in.wg. (1.5 kPa) and may be installed in vertical walls or partitions, or horizontally in floors or assemblies with fire resistance ratings up to 4 hours.

Standard Construction

Frame: 5" x 1" (127 x 25) galvanized steel at channel with interlocking corner gusset. Equivalent to 13 ga. (2.4) channel frame. Low profile head and sill are used on sizes less than 13" (330) high.

Blades: 6" x 14" ga. (152 x 2.0) galvanized steel - airfoil.

Axles: 1/2" (13) diameter plated steel hex.

Linkage: Concealed in frame.

Bearings: Stainless steel oilite, sleeve-type.

Seals: Silicone blade edge seals integrally rolled and mechanically fastened to blades. Flexible metal jamb seals.

Fire Closure Device: Fusible link.

Fire Closure Temperature: 165^oF (75^oC)

Minimum Size: 8" x 6" (203 x 152)

Maximum Size:
Single Section: Vertical: 36" x 48" (914 x 1219)
Horizontal: 32" x 48" (813 x 1219)
Multiple Section: Vertical: 120" x 96" (3048 x 2438) 
Horizontal: 64" x 96" (1626 x 1829)

Ratings

UL 555 Fire Resistance Rating: 3 hour (vertical and horizontal)

Maximum Dynamic Closure Velocity:
4,000 fpm (20.3 m/s)
2,000 fpm (10.2 m/s) Multiple Sections

Maximum UL 555S Rated Pressure:
6 in. wg. (1.5 kPa)
4 in. wg. (1.0 kPa) below 8" in height