High Quality: This rooftop fan is high hardness, high and low temperature resistant, anti-corrosion, anti-rust, durable, sturdy and reliable. High Performance: This roof fan uses air convection and thermal convection caused by natural wind and temperature difference between inside and outside to drive the turbine to rotate. Use centrifugal force and vacuum to expel old internal air. Good Helper: Having this roof fan can replace the indoor air and purify the indoor air, which is very suitable for wind conditions and can be used in all kinds of ventilation slots. Widely Applicable: this roof fan can be applied to industrial plants, farms, living room fireplaces, etc. Quality Service: If you have any questions about this product, please contact us in time, we will give you a satisfactory solution within 24 hours., Weight: 3.086471668 pounds, Manufacturer: YILIKISS