58 EAR/DR

UL Classified for use in UL 263 wood truss floor/ceiling assemblies rate 1 hour or less.

• 1 hour wood truss CRD assembly
• Approved UL L-587 design
• Incorporates UL 555C evaluated ceiling damper
• EAR = Field installed 1.5" R-6 or 2" R-8 ductboard box
• DR = Factory installed 1.5" R-6 or 2" R-8 ductboard box
• Available in range of sizes from 4"x8" to 20"x16"