Model RD-521-NP90

1 Hour - Ceiling Radiation Damper
90° Plenum - Butterfly Style Blade

The RD-521-NP90 ceiling radiation damper employs butterfly style blades for point-of-origin control of radiant heat in HVAC systems. The RD-521-NP90 is installed horizontally in the ceiling membrane of combustible floor-ceiling or roof-ceiling assemblies with fire resistance ratings up to and including 1 hour. The RD-521-NP90 must have a field supplied outlet box installed on it.

Standard Construction

Frame: 22 gauge (0.85) galvanized steel.
Blades: 22 gauge (0.85) galvanized steel – butterfly. Insulated with ceramic refractory material.
Transition: None (field adaptation required).
Plaster Ground: 5/8" (16) deep × 7/8" (22) wide std.
Closure Device: Fusible link.
Fire Closure Temperature: 165°F (75°C).
Minimum Size: 4" × 6" (102 × 152)
Maximum Size: Square: 12" × 12" (305 × 305) 14" (356) W or 10" (254) H with a maximum area of 144 in². (929 cm²)
 

Ratings

UL 555C Fire Resistance Rating: 1 hour for installation in floor designs L-521, L-528, L-546, L-558, L-562, L-574, L-576, L-581, L-583, L-585, M-509, M-540 and in roof/ceiling designs P-522, P-533, P-538, P-545, P-547, P-579, and P-580.
UL 555C listing: R14980
CSFM listing: 3226-1404:100
Meets NFPA Standards: 90A and 101
Meets Building Code Standards: IBC, NBC, NFPA, SBC and U