Particular axial flow fan for multi-stage variable speed for tunnel construction ventilation.

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The motor uses multiple stages of the same body to achieve speed change. This series of fans consists of three magnetic poles of 4/6/8 class, which enables the fan to achieve three working speeds of 1480/980/740.

In tunnel excavation construction, the multi-stage variable speed fan can save much energy by using the progress difference and the speed.

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