Radial "Axial Fan" has two, based on the flow direction of the fan air operation carried out division. When the axial flow fan is operating, the blade pushing air with the flow axis in the same direction, so called axial-flow fan; while a radial fan at the blade axis perpendicular to the pushing direction (i.e, radial) flow of air, thus fans called runoff. Divided into large this fan axial type fan, this fan of medium and small this fan, this fan according to choose the appropriate use of local needs. In general, a large this fan is mainly used in place of the exhaust dust, gravel field and the like; medium-sized this fan is mainly used indoors with ventilation and heat, for example: barn, etc; small this fan is mainly used mechanical ventilation and cooling equipment, such as: electrical cabinets.