Model FD4D-B

1-1/2 Hour - Dynamic Rated - Fire Damper
Curtain Style Blade

The FD4D-B fire damper employs out of the airstream curtain style blades for point-of-origin control of fire in static and dynamic HVAC systems. The FD4D-B 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, or horizontally in floors or assemblies with fire resistance ratings up to 2 hours.

Standard Construction

Frame: 22 ga. (0.85) galvanized steel.
Blades: 24 ga. (0.7) galvanized steel - curtain style.
Fire Closure Device: Fusible link.
Fire Closure Temperature: 165^oF (75^oC)
Minimum Size: 6" x 4" (152 x 102)
Maximum Size: Single Section: Vertical: 36" x 44" (914 x 1118)
                                                    Horizontal: 36" x 33" (914 x 838)
                           Multiple Section: Vertical: 120" x 69" (3048 x 1753)
                                                                    72" x 117" (1829 x 2972)
                                                       Horizontal: 36" x 34" (914 x 864)
                                                                         72" x 16" (1829 x 4067)
Stainless Steel: Single Section: Vertical: 36" x 33" (914 x 838)

Ratings

UL 555 Fire Resistance Rating: 1-1/2 hour (vertical and horizontal)
UL HNLJ.V-5: Ventilation Duct Assemblies

UL 555 Listing: R14981
CSFM Listing: 3225-1404:101
New York City MEA Listing: 295-98-E
Meets NFPA Standards: 90A, 92A, 92B and 101
Meets Building Code Standards: IBC, NBC, NFPA, SBC and UBC