The Lomanco 12-inch galvanized turbine fits any 7/12 roof pitch, meaning any roof that rises 7 inches for every 12 inches it runs. Constructed with .025-inch stamped galvanized steel, this exhaust vent is available internally and externally braced. It features permanently lubricated ball bearings. Ideal for residential or light commercial use, this galvanized turbine comes with a lifetime warranty.