Architectural · A-RMD4N

UL Compliant Steel Bent Plate Duct Penetration at Gypsum Partition

Materials

Elements

Waterproofing / Flashing Connections / Plates

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A metal duct penetrates a rated gypsum board partition framed with double studs at each opening. Steel bent plate retaining angles are installed on both sides of the partition and attached to the duct with sheet metal screws, overlapping the partition opening by one inch minimum. Fire-rated sealant with optional backer rod is applied to each side of the partition. 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 two-hour rating per UL W-L-7008 or equivalent.

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