PURPOSE: To make it possible that air flow reaches a distant place without causing diffusion of blowoff air flow and the substantial blasting capacity and blasting efficiency improvable by providing a stationary blade for deflection that deflects blowout air flow to the centripetal direction at the air blowoff exist of a fan.

CONSTITUTION: When a propeller fan 5 is driven to rotate, the turning flow that axially proceeds rotating to the right side of the centrifugal direction facing to the moving blade structure of the propeller fan 5 is formed, and the turning flow is blown off from the air blowoff exist 4 of a fan casing 1 at a specified flow speed. Here, since a stationary blade 6 positioned at the connecting part of the blowoff exit 4 in the shape of spiral plate and forms the turning flow in the reverse direction of the turning flow formed by the propeller fan 5 is provided, the flow remaining intact is converted to the turning flow in the centripetal direction by the stationary blade 6 and blown off downward at a high speed. As a result, the blowoff flow becomes the blowoff flow of nearly the same diameter, and, since the lowering degree of the dynamic pressure energy is small, the reachable downward range l2 becomes fairly large, and results in the enhancement of blasting capacity and blasting efficiency substantially.