The exhaust fan is mounted atop a prefabricated and insulated curb, which maintains a minimum height of 12 inches above the finished roof surface. The sheet metal duct is secured to the interior of the curb with screws. A backdraft damper is installed within the duct penetration. The roof penetration is sealed with a flexible waterproof mastic, and the curb is finished with flashing and counter-flashing provided by the general contractor.
Members view this detail in full resolution, download the CAD files (SVG, PDF), and open any detail in the built-in CAD editor to edit and export DXF or DWG.
Sign in to subscribe