Model FD4-3B

3 Hour - Static Fire Damper
Curtain Style Blade

The FD4-3B fire damper employs tcurtain style blades for point-of-origin control of fire in static HVAC systems. The FD4-3B 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: 22 ga. (0.85) galvanized steel.
Blades: 24 ga. (0.7) galvanized steel - curtain.
Fire Closure Device: Fusible link.
Fire Closure Temperature: 165^oF (75^oC)
Minimum Size: Vertical Mount: 4" x 2" (102 x 51)
                           Horizontal Mount: 6" x 8" (152 x 203)
Maximum Size: Single Section: Vertical: 36" x 33" (915 x 838)
                                                    Horizontal: 38" x 33" (965 x 838)
                           Multiple Section: Vertical: 108" x 21" (2743 x 533) 
                                                      Horizontal: 76" x 93" (1931 x 2362)
Stainless Steel: Single Section: Vertical: 36" x 21" (914 x 553)
                            Multiple Section: 108" x 21" (2743 x 533) 

Ratings

UL 555 Fire Resistance Rating: 3 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