1. Unoperated Roof Vent Utilizing the convection principle of natural wind and air, the turbo fan accelerates parallel airflow into vertical airflow, enhancing indoor ventilation. As hot air rises and cold air descends, the fan rotates, effectively expelling internal heat, odors, and dust. Energysaving with no electricity consumption, reducing your power bill. 2. MultiPurpose: Functions as a rotary hood for ventilation ducts, chimneys, and exhausts. The lacing offers maximum protection without compromising chimney performance. Ideal for chimneys that are infrequently used. Features a stainless steel structure with thickened fixed feet and includes a complete mounting kit. 3. Protection: Made of thick stainless steel, the rotating chimney hood is antisinking and compatible with most standard chimney hoods. effective in wind resistance and boosting ventilation. Protects chimneys from rain and moisture, especially suited for those not in regular use. 4. Noiseless and Rainproof: The roof ventilation fan operates silently. 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, intensifying the inwardtooutward airflow.