UL Fire Rated Floor/Ceiling assemblies and Roof/Ceiling assemblies require specially tested and classified ceiling dampers (also called Ceiling Fire Dampers or Radiation Dampers) to provide fire and heat protection where HVAC components penetrate the ceiling membrane. Standard, 1-1/2 hour primary fire dampers DO NOT provide the necessary protection.
CCD and CCDR are UL Classified to provide protection to HVAC penetrations of up to 324 sq. in. maximum opening size through UL fire rated assemblies with the fire resistance rating of 3 hours or less for penetrations larger than 324 sq. in. and up to 576 sq. in. The quantity and frequency of permissible HVAC ceiling penetrations are described in the UL Fire Resistance Directory.
WOOD TRUSS CEILING APPLICATION
CCD and CCDR Ceiling Fire Dampers are also UL approved for use in ceiling design L555. L555 is constructed from 2 x 4 wood trusses and are similar to ceiling designs L528, L521, L534, L546, L555, etc. The CCD and CCDR must be installed in insulated steel duct drop in accordance with the manufacturers installation instructions provided with the dampers.