Mine axial flow fans are generally composed of collectors, main units, muffler diffusers (including rear guide vanes) and other components.
Mine axial flow fans generally consist of a collector, a primary main unit, a secondary main unit, a silencer and a diffuser tube and other components. The motor terminal box is led out to the fan housing through an extension tube.
Under normal circumstances, this series of ventilators are installed on the ground with a muffler diffusion tower, but not when used for auxiliary ventilation underground.

Here is the introduction of mine axial flow fans.