1. Unoperated Roof VentThe turbo fan utilizes the convection principle of natural wind and airflow to accelerate parallel airflow into vertical airflow, enhancing indoor ventilation. Hot air rises and cold air sinks, causing the fan to rotate, effectively expelling internal heat, odors, and dust. Energysaving with no electricity consumption, reducing your power bill. 2. Versatile UseRotary hood suitable for ventilation ducts, chimneys, and exhaust systems. The lacing provides maximum protection without compromising chimney performance. Ideal for chimneys that are not frequently used. Features a stainless steel structure with thickened fixed feet and includes a complete mounting kit. 3. ProtectionThick rotating chimney hood made of stainless steel, designed to rotate without sinking. Compatible with most standard chimney hoods, effective in wind resistance and improved ventilation. Protects chimneys from rain and moisture, especially suitable for infrequently used chimneys. 4. Noiseless RainproofThe roof vent operates silently during rotation. The closely spaced downwardprotruding slats prevent rainwater from entering the ventilation system. The hood rotates with wind force—the stronger the wind, the faster the blades spin, enhancing internaltoexternal airflow.