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Unpowered fan is a kind of device that utilizes natural wind speed to drive the turbine rotation of the fan, and utilizes the principle of indoor and outdoor air convection to accelerate and change the air flow in any parallel direction into vertical air flow from bottom to top, so as to improve the ventilation and ventilation effect. The fan has no electricity, no noise, and can run for a long time. According to the natural law of air and the principle of air flow, it is rationally set on the roof, which can quickly discharge indoor heat and dirty gas and improve the indoor environment.
