An exhaust fan sits atop a roof curb that is installed level on sloped roofs with supporting cant and framing sized per architectural and structural drawings. The exhaust duct extends over the top of the curb beneath a curb cap, protected by a birdscreen. A motorized damper is integrated into the vertical exhaust duct section below the roof line, alongside an access door for maintenance. The roof assembly and insulation details are coordinated with the architectural drawings, and the duct continues down into the building space.
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