**Thick stainless steel polishing ment, elegant spherical appearance, decorate your new home, so that your outer wall is no longer a black hole, the rotating cover rotates with the natural wind, the more the wind, the more the multiple, the more the blade rotates if there is more , The greater the demeanor from the inside to the outside, the more visceral air is discharged. **Rotating turbofan:The top of the fireplace can withstand changes in weather and ensure stable ventilation of the fireplace in unfavorable winds. Just place the hood on the chimney and tighten it. This facilitates disassembly, for example for cleaning. **The turbo fan uses the principle of convection between natural wind and air to accelerate parallel airflow into vertical airflow, thereby improving indoor ventilation.The pillar is a ball bearing, no noise is generated when rotating. The structure of the hat makes it flip under the action of the wind. The more the wind blows, the more the leaves turn and the more air from the inside to the outside. **There is no noise when the roof ventilation fan rotates. The distance between the downwardly protruding slats is small enough to prevent rainwater from entering the ventilation system. Stainless steel material is very strong and resistant to rust., Manufacturer: KNBHGUJMD