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Pottorff > Fire - Smoke Dampers > Fire Dampers > Dynamic 3 Hr Rated > FD-340

Model FD-340

3 Hour - Fire Damper
Triple-V Blade

The FD-340 fire damper employs triple-V blades for point-of-origin control of fire in static and dynamic HVAC systems. The FD-340 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 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 16" ga. (152 x 1.6) galvanized steel - triple-V.

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

Linkage: Concealed in frame.

Bearings: Stainless steel oilite, sleeve-type.

Seals: Flexible metal jamb seals.

Fire Closure Device: Fusible link.

Fire Closure Temperature: 165oF (75oC)

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

Maximum Size:
Single Section: 36" x 48" (914 x 1219)
Multiple Section: 72" x 48" (1829 x 1219) or 36" x 96" (3048 x 1829)

Stainless Steel: Single Section: 36" x 48" (914 x 1219)

Ratings

UL 555 Fire Resistance Rating: 3 hour (vertical)

UL HNLN: Ventilation Duct Assemblies

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)

 

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