Roof ventilator,roof turbo ventilator 1. stong rust resistant capability, 2.energy saving, 3.easy to operate Roof ventilator Character: 1. Zinc of steel:180g/m2, stong rust resistant capability, long severce life. Also stainless steel , Galvalume material for choice. 2. Multi-angle turbineturbine can be altered, This kind of turbine can be installed on many kind of roof , easy to operate. 3. ...