As little as 10% mis-adjustment of the "HOT SPOT" can reduce cleaning efficiency by 25% or more!

CORRECT SETTING
In the sketch of a clockwise down blast wheel, the centre of the "HOT SPOT" is located directly below the right hand blade, when in the horizontal position. The location of the "HOT SPOT" is directly controlled by the setting of the control cage opening, which, in this sketch is set at "11 o'clock".