Mechanical · M-BYW48

Fire Smoke Damper Installation in Rated Wall

Materials

Steel Metal (misc.)

Elements

Walls Connections / Plates Reinforcing

Connections

Welded Connection Bolted Connection

About this detail

A fire and smoke damper assembly is installed within a minimum eighteen-gauge galvanized steel sleeve penetrating a fire-rated construction wall. The damper unit is secured to the sleeve using bolts, welds, or rivets spaced identically to the retaining angles. Galvanized steel retaining angles measuring a minimum of one and one-half inches by one and one-half inches by one-eighth inch are fastened to the sleeve with half-inch tack welds, number ten sheet metal screws, one-quarter-inch diameter nuts and bolts, or three-sixteenth-inch steel rivets at eight 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. Clearances allow for thermal expansion with one-eighth inch per foot of damper height at the top and one-eighth inch per foot divided equally on both sides of the collar, up to a maximum total side and top clearance of one-half inch each. A heat sensor or firestat and a damper motor are provided, with a smoke detector installed within five feet of the fire smoke damper by the electrical contractor for fire alarm integration. Sheet metal ductwork connects via breakaway joints on both sides, and fire damper access must be labeled in red lettering on a white background minimum one inch high.

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