风机房连接风道断面型式采用方形效果较好。
The cross-section of connecting tube in fan room designed to square cross section is better.
矩形流道断面以正方形为最优，且存在最优角圆，使单位长流道沿程水力损失最小。
The optimum passage section figure of rectangle is square, and the rectangle has 4 optimum comer circular arcs which make the hydraulic loss of friction loss of per unit length passage the least.
尽管方形有更多的使用空间，但在断面连接处，竖井一般被设计成圆形。
In the aspect of cross-section, the shaft is generally designed in a circular shape in spite of the fact that the rectangular type has more versatile usage of space.
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