Mechanical · M-FJNFM

Kitchen Exhaust Fan Mounting at Fluted Metal Deck

Materials

Steel Timber / Wood Metal (misc.)

Elements

Beams Roofs Decks Insulation Site / Paving Roof / Floor Openings

Connections

Bolted Connection

About this detail

A prefabricated roof curb with a wood nailer and raised cant sits atop an eight-inch minimum pressure-treated Douglas fir leveling rail, which is leveled to clear the rigid roof insulation with a minimum height of three inches. Ten-gauge channel fillers shaped to match the metal deck flutes are installed beneath the framing, with channels between framing provided as required per structural drawings. The exhaust/relief fan or kitchen exhaust fan is secured to the curb using three-eighths-inch diameter bolts, washers, and locknuts spaced at twelve inches on center at each end, or secured with three-eighths-inch diameter by one-and-a-half-inch cadmium-plated lag bolts at sixteen inches on center with a minimum of two per side, incorporating beveled washers. A backdraft damper is supplied by the fan manufacturer but is omitted specifically for the kitchen exhaust fan system.

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