201 stainless steel hood: sturdy and durable, weatherproof and rainproof, high wind speed, zero power consumption and 360 silent rotation. Ventilation and exhaust, air circulation, the turbine blades will never deform in high speed operation Galvanized roller: the strength of the chimney cover is strong enough to withstand the wind speed of 200 kilometers per hour and the load pressure of 100 kg without deformation or damage. Lower temperature: In summer, the rotating ventilation fan can reduce indoor heat accumulation, thereby lowering the indoor temperature and providing a comfortable working environment. Rotating Vents: Arc-shaped fan blades can ensure that rainwater will never intrude into the working conditions. High exhaust efficiency and light operation. The variable angle neck tube design allows the fan to be installed at a slope of 0-22.5, which is easy to install. Residential or factory, commercial Save energy. The chimney cap installed on the roof chimney terminal does not generate any energy, but is driven by the wind and can be easily rotated. The stronger the wind, the faster the rotation and the faster the air circulation. Used for bathroom, kitchen, warehouse, home, apartment, chimney, farm, factory roof, ventilation ducts, air vents and exterior wall ventilation . Prevent pipes from getting clogged with nests and debris Specification: Name: Roof Vent Cap Material: 201 stainless steel (internal plating) Function: Ventilation, Exhaust, Ventilation, Heat Dissipation size: 110mm packing list: 1 roof fan, 1 clamp