Master Flow 12 in. Galvanized Externally Braced Turbine Head in Weathered Wood
Master Flow 12 in. Galvanized Externally Braced Turbine Head in Weathered Wood. The GAF Master Flow externally braced turbines are efficient, easy-to-install venting options for your roof. They are designed with upper and lower steel ball bearing systems for years of trouble-free operation.