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国内目前已研制成功一种新型屋顶通风器——球型风帽。样品经北京大学环境科学中心在大型风洞内测试;排风能力强,竖向风适应性能好,水平风时单位面积排风量比筒形风帽高20～50％,竖向风时高出200～300％。防倒风、防雨雪溅落功能好,造型美观、结构牢固。综合性能优于苏欧,日本等国家的风帽,该项成果已获国家专利。球形风帽设计为组合式结构,分部件制
At home, a new type of roof ventilator, ball-type wind cap, has been successfully developed. The sample was tested in a large wind tunnel by the Environmental Science Center of Peking University; the exhaust capacity is strong, and the vertical wind adaptability is good. When the horizontal wind blows, the amount of exhaust per unit area is 20-50% higher than that of the cylindrical wind cap, and it is higher when the vertical wind blows. 200 to 300%. Anti-wind, anti-rain and snow splashing function is good, beautiful shape, solid structure. The overall performance is better than that of the Soviet Union, Europe, Japan and other countries. This achievement has obtained national patent. The spherical wind cap is designed as a modular structure, divided into parts