roof fan 屋顶风机 ; 屋顶送风器
roof-fan 屋顶式通风机
roof vent fan 屋面排风机
fan tail roof 扇形烟道拱
fan efficiency roof 扇形花格交叉拱顶
roof fan detail 屋顶通风扇
roof axial fan 屋顶轴流风机
His plans involve building an air shaft through the roof of the control center equipped with a solar powered fan to draw air deeper into the complex.
他计划在控制室的顶上装一套太阳能驱动的换气系统，将空气泵到设施的深处。
Fan stopped, the roof like a steamer covers, house more hot. At this time, a wisp of cool wind by, and my heart is lost.
风扇停了，屋顶像一个蒸笼盖罩着，房子里更热了。这时，一缕凉风擦肩而过，我内心渐渐失落了。
This paper mainly introduces the frequency control technique and technical innovation for large-type roof fan.
简介了大型屋顶风机变频调速技术及技术创新性。
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