Architectural · A-R38VM

Duct Penetration @ Wall

Materials

Elements

Insulation Partitions Roof / Floor Openings Walls

About this detail

A rectangular steel HVAC duct passes through a rated partition wall assembly detailed with a fire damper or fire smoke damper conforming to UL555 or UL555S standards. The annular space around the duct is tightly packed with safing insulation on all sides and filled with fire stop sealant to the full depth of the gypsum board sheathing. Retaining angles, cut to fit the contour of the duct and featuring a minimum one-and-a-half-inch overlap onto the adjacent wall, secure the assembly. These angles are fastened to the duct using minimum number eight by three-quarter-inch sheet metal screws spaced at a maximum of six inches on center.

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