Heavy duty turbine roof vent for warehouses, residential, industrial, general commercial and agricultural buildings. The internally braced ventilators are constructed with a sealed bearing system that required minimal maintenance over time. Green 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 in stainless steel or copper. For high wind scenarios the externally braced model is recommended. Sizes available of the internally braced turbine model are 4 inch to 48 inch. The externally braced turbines are available from 8 inch to 24 inch.