- Silent and rainproof: The turbine operates quietly when the roof vent turns. The spacing between the downward facing blades is small enough to prevent rain from entering the ventilation system. The cap is designed to rotate with the wind; stronger wind makes the blades turn faster and increases air exchange from inside to outside. - Superior protection: Thick rotating stainless steel chimney cap with rotating rain protection; fits most standard chimney caps; highly effective against wind and improves ventilation. Protects your chimney from rain and moisture, especially for fireplaces that are not used frequently. - Versatile and durable: Rotatable cap for ventilation ducts, chimneys and exhaust systems. The securing system provides maximum protection without compromising chimney performance. Especially suitable for rarely used chimneys. Stainless steel construction with thick fixed feet; includes a complete mounting kit. - Power-free roof ventilation: The turbine uses natural wind convection to convert parallel air flow into a vertical flow, improving indoor ventilation. Hot air rises and cold air falls, causing the vent to rotate so heat, odors and dust are effectively vented from indoors. Energy saving and no electricity required. - Use scenarios: Ideal for a rarely used fireplace in windy locations to prevent rain while maintaining ventilation; can be used on ventilation ducts or exhausts where no electrical power is available; suitable for seasonal homes or chimneys that are not frequently used.