"Axial Fan" has an impeller vanes and import and export in the enclosure. Such as adjustable guide vanes at the exit velocity design condition pre-guide vane axial, when conditions change, you can change the angle of the vanes to adapt to changes in traffic. It is possible in a wide range of flow rate, to maintain high efficiency. "Axial Fan" This type applies to changing flow conditions. The disadvantage is that complex structure, increase manufacturing, operation, and maintenance difficulties, so less used. "Axial Fan" and axial-flow pump structure is basically the same. Main shaft, impeller, collector, guide vanes, housing, rotor blade adjustment device, the main components of air intake box and the diffuser and the like.