RD-4

Model RD-4

3 Hour - Ceiling Radiation Damper
Low Profile Butterfly Style Blade

The RD-4 ceiling radiation damper employs low profile butterfly style blades for point-of-origin control of radiant heat in HVAC systems. The RD-4 is installed horizontally in the ceiling membrane of floor-ceiling or roof-ceiling assemblies with fire resistance ratings up to and including 3 hours. The RD-4 is specifically designed for assemblies having limited space between the ceiling membrane and the structure above.


Standard Construction

Frame: 22 ga. (0.85) galvanized steel.
Blades: 22 ga. (0.85) galvanized steel - butterfly. Insulated with ceramic refractory material for dampers larger than 114 in2 (735 cm2).
Fire Closure Device: Fusible Link.
Fire Closure Temperature: 165oF (75oC).
Minimum Size: 6" x 12" (152 x 305)
Maximum Size: 24" x 24" (610 x 610)


Ratings

UL 555C Fire Resistance Rating: 3 hour (horizontal, for use in 1, 2 or 3 hour rated assemblies).

UL 555C Listing: R14980
CSFM Listing: 3226-1404:100
Warnock Hersey Listing #: WHI-495-PSH-0177, -0178
Meets NFPA Standards: 90A and 101
Meets Building Code Standards: IBC, NBC, NFPA, SBC and UBC