1 Hour - Ceiling Radiation Damper
The RD-521-NP-D/P ceiling radiation damper employs butterfly style blades for point-of-origin control of radiant heat in HVAC systems. The RD-521-NP-D/P 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-NP-D/P must have a field assembled outlet box installed in it.
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 in.2 (735 cm2)
Transition: None (field adaptation required.)
Plaster Ground: 4" (102) deep x 1" (25) wide.
Closure Device: Fusible Link.
Fire Closure Temperature: 165oF (75oC).
Minimum Size: 4" x 6" (102 x 152)
Maximum Size: Square: 16" x 16" (406 x 406)
Rectangular: 24" (610) W or 20" (508) H
with a maximum area of 256 in.2 (1652 cm2).
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