On-Line Catalog : Ceiling Radiation Dampers > Wood Truss > CFD-521-BT
Model CFD-521-BT 1 and 3 hour — ceiling radiation damper
R-6.3 or 8.0 insulated outlet box — butterfly style blade
The CFD-521-BT ceiling radiation damper employs butterfly style blades for point-of-origin control of radiant heat in HVAC systems. The CFD-521-BT is installed horizontally in the ceiling membrane of combustible and non-combustible assemblies with a fire-resistance rating up to and including 3 hours.