Golden Engineering Co. Pvt. Ltd. Supplies Free Spinning Roof Air Ventilator. Golden Engineering Co. Pvt. Ltd. Is the manufacturer of engineering components and powerless turbine ventilators. Free Spinning Roof Air Ventilator is a combination of both natural and forced air ventilation system. Free Spinning Roof Air Ventilator works on free wind energy. It functions as a natural ventilator when there is a difference in thermal or wind pressure between the inside and outside of the building which forces the air to move through the opening of the ventilator. These ventilators are available in the range from 12 to 36 inches.
