This paper mainly introduces the frequency control technique and technical innovation for large-type rooffan.
简介了大型屋顶风机变频调速技术及技术创新性。
2
WT35-11 comes as an axial-flow rooffan that features low and medium levels of pressure and heavy wind flow and can be geared to the needs of blowing, exhaust and double-rotation reversible mode.
WT35-11型为屋顶轴流式通风机，该风机为中低压大流量风机，可设计成送风、排风或双旋转可逆式。
3
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.