1 Hour - Ceiling Radiation Damper
The RD-521 ceiling radiation damper employs butterfly style blades for point-of-origin control of radiant heat in HVAC systems. The RD-521 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.
Frame: 22 ga. (0.85) galvanized steel with integral outlet box.
Blades: 22 ga. (0.85) galvanized steel - butterfly. Insulated with ceramic refractory material for dampers larger than 114 in2 (735 cm2).
Transition: Round, with 2" (51) deep collar, located on W side of outlet box.
Plaster Ground: 5/8" (16) deep x 5/8" (16) wide.
Closure Device: Fusible Link.
Fire Closure Temperature: 165oF (75oC).
Minimum Size: 4" x 6" (102 x 152)
Maximum Size: Square: 18" x 18" (457 x 457)
Rectangular: 24" (610) W or 20" (508) H with a maximum area of 324 in2 (2090 cm2)
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