Architectural · A-SBM5V

Metal Duct Penetration at Fire-Rated Gypsum Partition

Materials

Elements

Walls Partitions Floors / Slabs Roof / Floor Openings

About this detail

A galvanized metal duct penetrates a one-hour or two-hour fire-rated metal-framed gypsum board partition with an annular space sealed by firestopping sealant. The fill material is applied to a minimum five-eighths inch thickness within the annulus, flush with both surfaces of the wall, supplemented by a minimum half-inch diameter bead of fill material at the wall and duct interface on both sides. A sixteenth gauge galvanized steel retaining angle, cut to fit the duct contour with a two-inch overlap on the duct and a one-inch overlap on the gypsum board assembly, is secured to the duct on both wall surfaces using number eight by three-quarters inch long sheet metal screws spaced at six inches on center maximum. Fire smoke dampers are included as required by mechanical plans and building codes, maintaining a maximum wall opening size of thirteen hundred square inches.

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