Architectural · A-XFT6T

Duct Penetration through Fire-Rated Partition

Materials

Concrete Steel Masonry / CMU Gypsum / Drywall

Elements

Walls Waterproofing / Flashing Connections / Plates

About this detail

A metal duct passes through a fire-rated concrete wall or concrete masonry unit partition, maintaining a one-inch minimum opening overlap. Fire-safing insulation and typical fire-rated sealant fill the annular space around the duct at both sides of the partition. Underwriters Laboratories-complying steel bent plate retaining angles are attached to the duct with sheet metal screws on both sides. Duct insulation stops at the fire-rated partition, and the vapor barrier is sealed to the gypsum board where applicable. The assembly achieves up to a three-hour fire rating per Underwriters Laboratories system C-AJ-7016 or equivalent.

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