Heavy duty turbine roof vent for warehouses, residential, industrial, general commercial and agricultural buildings. The externally braced ventilators are constructed with a sealed bearing system that required minimal maintenance over time and are recommended for climates where extreme wind scenarios or experienced. Turbine ventilators provide a green, environmentally friendly ventilation alternative powered by inside air and wind propulsion. Primary material offerings are galvanized steel turbine vents and aluminum turbine vents. Also available in limited sizes of the internally braced turbines are stainless steel or copper models. For high wind scenarios the externally braced model is recommended. The externally braced turbines are available from 8 inch to 24 inch.