Mechanical · M-PGWBK

Fire and Smoke Damper Vertical Wall Penetration Detail

Materials

Steel Metal (misc.)

Elements

Walls Doors Connections / Plates Roof / Floor Openings

Connections

Welded Connection Bolted Connection

About this detail

A fire and smoke damper assembly penetrates a fire-rated wall. The rectangular duct connects to a galvanized sheet metal sleeve, sized at minimum sixteen gauge for duct widths up to thirty-six by twenty-four inches, and minimum fourteen gauge for larger sizes. Angle retainers are installed on both sides of the wall attached exclusively to the sleeve, with sizing varying by wall fire rating and opening dimension: twenty gauge angles for one-and-a-half-hour walls up to forty-eight inches, and sixteen gauge for larger openings and all three-hour walls. The wall opening is maintained one-quarter to three-quarters of an inch larger than the overall sleeve and damper size. Connections between the ductwork and sleeve utilize number ten screws, one-quarter-inch bolts, three-sixteenth-inch steel rivets, quick-lock joints, or welds at eight-inch maximum centers with a minimum of two per side. A normally open damper blade assembly includes a fusible link with lock and negator spring attachments, alongside a damper operator and actuator with an operating shaft and fusible rod. A permanently attached access door with one-half-inch high lettering marks the fire and smoke damper location.

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