A mine fan in which the air enters along the axis parallel to the shaft
and is turned through a right angle by the blades and discharged radially.
There are three main types with (1) backwardly inclined blades; (2) radial
blades; and (3) forward curved blades. In (2) and (3) the blades are made
of sheet steel, while in (1) the present tendency is to replace curved
sheet-steel blades by blades of aerofoil cross section. The aerofoil
bladed radial-flow fan has an efficiency of about 90%.
CF: axial-flow fan;
mixed-flow fan. Nelson
Dictionary of Mining, Mineral, and Related Terms