Mechanical · M-4E2VM

Up-Blast Exhaust Fan Roof Curb Detail

Materials

Timber / Wood

Elements

Roofs Insulation Site / Paving Anchors / Embeds Roof / Floor Openings

Connections

Welded Connection Embed Plate

About this detail

An up-blast exhaust fan with a maximum weight of 220 pounds is secured to an 18-gauge manufacturer curb with continuously welded corners and a wood nailer. The fan attaches to the curb using number 12 by 2-inch long hex washer head self-drilling screws spaced per schedule. The roof curb is anchored to the roof deck using 3/8-inch diameter Hilti KB-TZ expansion anchors with 1-1/2 inch embedment at each corner. A NEMA 3R disconnect switch is factory wired from the motor through a breather tube. Prefabricated roof curb insulation has a minimum thickness of 1-1/2 inches.

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