Mechanical · M-3WGNN

Combination Firesmoke Damper Detail

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A combination fire and smoke damper is installed within a rated partition framed with steel studs and finished with gypsum board by others, maintaining a required clearance of one-eighth inch per foot with a one-quarter inch minimum. The assembly utilizes an integral twenty-gauge steel sleeve secured with one-and-a-half-inch by one-and-a-half-inch fourteen-gauge steel angles mounted per manufacturer instructions. Ductwork connects to the sleeve via typical breakaway slip duct connections. The damper frame houses operable damper blades, a fusible link with lock, a fusible rod, and a motorized actuator mounted directly to the sleeve with associated power wiring. An access door measuring a minimum of twelve by twelve inches provides maintenance entry, and a required label per California Building Code section 713.13 features minimum one-inch high letters reading fire door do not obstruct.

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