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UL 521 Listed
Basis of Design
Multifamily Ready
Fast Lead Times

UL Rated, Fire, Smoke, and Ceiling Radiation Dampers /Ceiling Radiation Dampers /Wood Truss Systems /Insulated Outlet Box

RD-521-BT

1 Hour - Ceiling Radiation Damper

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Common Applications

  • Wood Truss Assemblies
  • Multifamily
  • Light Commercial

Resources

Product Sheets

  • PDF RD521-BT Product Sheet

Installation Instructions

  • PDF RD521-BT/IP/NP/90 Installation

Overview

The RD-521-BT ceiling radiation damper employs butterfly style blades for point-of-origin control of radiant heat in HVAC systems. The RD-521-BT is installed horizontally in the ceiling membrane of combustible and non-combustible assemblies with fire resistance ratings up to and including 1 hour.

Standard Construction

Frame: 30 ga. (0.40) galvanized steel outlet box with 1-1/2" (38) thick fiberglass R-6.3 insulation.
Blades: 22 ga. (0.85) galvanized steel - butterfly.
Plaster Ground: 5/8" (16) deep x 1" (25) wide.
Fire Closure Device: Fusible Link.
Fire Closure Temperature: 165oF (75oC).
Minimum Size: Grille Opening - 4" x 4" (102 x 102), Duct - 4" Ø (102 Ø)
Maximum Size: Grille Opening - Square: 12" x 12" (305 x 305)
                                                      Rectangular: 24" (610) W or 24" (610) H
                                                      with a maximum area of 144 in2. (929 cm2)
                                                      Duct - 10"Ø (254 Ø)                              

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