Soffit Vents Exterior,Vent Cover, Silent Pipefit Roof Ventilating Fan, All Purpose Chimney Cowl Energy-Efficient(150mm)

【Unpowered Chimney Cap】The rotating chimney cap uses natural wind and air heat convection caused by the temperature difference between indoor and outdoor to drive the turbines to rotate and discharge indoor dirty air. 【Material】 The roof turbines vent is made of thickened stainless steel material, which is rainproof, proof, high hardness, durable, energy-saving, environmentally friendly, and easy to clean. 【Use】Suitable for use on chimneys, factory roofs, ventilation ducts, residential flues, vent pipe/hose warehouses, bathroom vents and extractors, air conditioning units, kitchen fans and vents. 【Noiseless Rainproof】The roof ventilation turbines makes no noise during rotation. The encrypted blade gaps are small enough to prevents rainwater from entering the ventilation system. It also prevents debris from entering. Wall mount air vent-- the specially designed air vent prevents rain and excessive wind from entering the ventilation system.