屋顶风帽是利用自然界的自然风速推动风机的涡轮旋转及室内外空气对流的原理，将任何平行方向的空气流动，加速并转变为由下而上垂直的空气流动，以提高室内通风换气效果的一种装置，它不用电，无躁音，可长期运转，排除室内的热气，湿气和秽气，其根据空气自然规律和气流流动原理，合理化设置在屋面的顶部，能迅速排出室内的热气和污浊气体，改善室内环境。
Roof hood is a device which uses the natural wind speed to drive the turbine rotation of the fan and the principle of indoor and outdoor air convection to accelerate and change the air flow in any parallel direction into the vertical air flow from bottom to top, so as to improve the indoor ventilation and air exchange effect. It does not use electricity, has no noise, can operate for a long time, and can eliminate the hot air, moisture and foul air in the room. The natural law of air and the principle of air flow, which are reasonably set on the top of the roof, can quickly exhaust the indoor hot gas and dirty gas, and improve the indoor environment.