Most ceiling diffusers (particularly diffusers designed to “lay-in” exposed T-bar grid systems) cannot be used as they require an opening larger than permitted in any floor/ceiling or roof/ceiling design. Lau’s CCD(R)5 diffuser radiation shield solves this problem. It permits any manufacturer’s lay-in style steel ceiling diffuser (subject to gauge and dimension limitations) to be installed in UL Classified floor/ceiling or roof/ceiling assembly with Fire Resistance Ratings of 3 hours or less.
Underwriter Laboratories “Fire Resistance Directory” classified hundreds of specific Floor/Ceiling Designs and Roof/Ceiling Designs and establishes Fire Resistance Ratings for each design ranging from ½ hour to 5 hrs. The majority of designs are rated at 2 or 3 hrs. Most Floor/Ceilings and Roof/Ceilings allow ceiling penetrations for HVAC on a limited and specific basis, typically one 12” dia. hole every 100 sq. ft. This hole must be protected in a very specific manner.
CCD5/CCDR5 Ceiling Radiation Damper for Lay-In Applications Catalog
CCD5/CCDR5 Installation Instructions
Ceiling Radiation Damper General Information
Fire/Life Safety Products Quick Reference Chart
Replacement Fuse Links
Ceiling Radiation Damper Ordering Made Easy