wind driven roof ventilator

Wind Turbine Air Ventilator. Roof Ventilator, Rooftop Turbine Air Ventilator. Rooftop Ventilator, Wind-Driven Turbine Ventilator. Turbine Air Ventilators. Wind Fans. Turbo Ventilator, Turbo Air Ventilators. Roof Turbo Ventilators. Rooftop Turbo Ventilator. Exhaust fans, VentilationModel: 6" 8" 10" 12" 20" 24" 27" 35"Benefits: Light weight, high revolving speed, strong corrosion resistance, high air exhausting efficiency, sturdy and durable, clean and smooth, uniform color and easy maintenance.Working condition: Temperature difference between indoor and outdoor is 0.45. It begins to revolve at the wind speed of 0.12m/sRoof Angle: Applied in different roofing in the scope of 0-22.5 obligue angle.Warranty: 15yearsFeatures:1) Do not need electric force2) Protection against high temperature, bad air environment3) Anti-corrosion, anti-acids and bases, anti-oxidation4) Long usage.