Mechanical · M-J6X9D

Fire Smoke Damper Installation at Rated Wall

Materials

Steel Metal (misc.)

Elements

Walls Connections / Plates Reinforcing

Connections

Welded Connection Bolted Connection

About this detail

A fire damper or smoke damper is installed inside an 18-gauge galvanized steel sleeve penetrating a fire-rated construction assembly. The damper is secured to the sleeve using bolts, welds, or rivets spaced identically toeterminate retaining angles. Galvanized steel retaining angles measuring a minimum of 1-1/2 inches by 1-1/2 inches by 1/8 inch are secured to the sleeve with 1/2-inch tack welds, number 10 sheetmetal screws, 1/4-inch diameter nuts and bolts, or 3/16-inch steel rivets at 8 inches on center, maintaining a minimum of two connections on each side, top, and bottom. These angles overlap the wall a minimum of one inch on all four sides with specific expansion clearances provided at the top and sides. Sheetmetal ductwork connects via breakaway joints on both sides of the assembly, located a maximum of 6 inches from the wall on the motor end and opposite end. A smoke detector or firestat heat sensor is integrated with the damper motor and coordinated with the electrical contractor for fire alarm tie-in, with damper access labeled clearly in red lettering on a white background.

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