Noiseless and rainproof: the curved fan blades with encrypted blades ensure that rainwater never intrudes under operating conditions. High exhaust efficiency Lightweight operation. Protects the chimney from incoming rain and moisture. Comes with complete fixing kit for easy installation Wind Turbines Air Vents: Utilizing natural wind and air thermal convection caused by the temperature difference between indoor and outdoor, the turbine is driven to rotate and expel the indoor air that is not circulating. Zero energy consumption, the galvanized rollers are strong enough to withstand wind speeds of 200 km/h and loads of 100 kg without deformation or damage. The curved fan blades ensure that rainwater never penetrates under operating conditions. High exhaust efficiency, Position the stainless steel roof wind turbine vent cover on the roof to achieve optimal airflow. Then ensure the vent is securely fastened to the roof to prevent any leaks. Easy to install: all hoods are shipped as a whole, no assembly required, comes with mounting kit for easy installation, just take it out and fix it. It efficiently removes stale air from the room whilst preventing rainwater from entering the ventilation system., Manufacturer: YKMYXZ