UL Classified For use in UL 263 wood truss floor/ceiling assemblies rated 1 hour or less.
- 1 hour wood truss CRD assembly
- Approved UL L-587 design
- Incorporates UL 555C evaluated ceiling damper
- Field installed 1.5" R-6 or 2" R-8 ductboard box
- Available in range of sizes from 6" diameter to 14" diameter