1. Nonpowered Roof VentilationThe turbine ventilator utilizes the convection theory of natural wind and air to accelerate parallel airflow into vertical airflow, thereby improving indoor ventilation. Hot air rises and cold air falls, causing the fan to rotate, which effectively discharges indoor heat, odors, and dust. Energysaving and no electricity bill, helping you reduce your power costs. 2. Multipurpose: Rotating hood for ventilation ducts, chimneys, and exhaust pipes. The lacing provides maximum protection without obstructing chimney performance. Especially suitable for chimneys that are not frequently used. Stainless steel structure with thickened sturdy legs; includes a complete mounting set. 3. Protection: Thick rotating stainless steel chimney cap, antisinking rotation, suitable for most standard chimney caps, effective in blocking wind and enhancing ventilation. Protects your chimney from rain and moisture, particularly ideal for chimneys that are not frequently used. 4. Noiseless and Rainproof: The roof ventilation fan operates silently when rotating. The downwardprotruding blades are spaced closely enough to prevent rainwater from entering the ventilation system. The hood is designed to rotate with the wind—the stronger the wind, the faster the blades spin, increasing the airflow from inside to outside.