Stainless Steel 304 Roof Wind Turbines Cap Vent Roof Ventilator, Non Power Chimney Cowl Attic Air Vent Outlet Ventilating Fan 4 8 10 12Inch Rotating Roof Vents, No Rust, No Deformation

The range hood installed in the chimney mouth of the roof does not generate energy, but is driven by the wind and can rotate easily. The strongers the wind, the faster it spins, promoting faster air circulation.Name: house chimney vent capMaterial: 304 stainless steel (internal plating)Function: Ventilation, Exhaust, Ventilation, Heat DissipationFeatures: zero consumption, zero noise, rainproof, rustproof, high speed, high hardness, long service life, prevents pipes from being blocked by nests and debrissize:110 mm (4.3 inches)150 mm (5.9 inches)200 mm (7.9 in)250mm (9.8")300mm (11.8")350mm (13.8")400mm (15.7 inches)pack:Vent hood x1Accessories: (110-250mm: 1 clamp, 300mm: 3 fixed feet, 350-400mm: 4 fixed feet)

• The turbo ventilator adopts the theory of convection between natural wind and air, accelerates and converts any parallel airflow into vertical airflow to improve indoor ventilation
• Various sizes. For chimneys, farms, factory roofs, commercial, ventilation ducts, houses, warehouses, residential buildings, etc.
• The top wind smoke extractor fan can be installed on a slope of 0-22.5 degrees, flat or inclined as you like. easy to install
• The roof ventilator is made of 304 stainless steel, which is durable, rust-proof, weather-resistant, non-deformable, and has a smooth surface
• The ventilation is strong enough to withstand 200km/h wind speed and 100kg load without deformation or damage.