The air passes through the vane ring where it disperses the incoming powder.

The coarse material continues in a spiral action and is discharged through a double flap valve located at the bottom of the classifier.

Coarse material has an unimpeded path to the outlet and is therefore efficiently classified without creation of additional fines by particle attrition.

Fines are carried with the classifying air through the patented classifier wheel to a separation cyclone or baghouse.

The constant velocity classifier wheel, dispersion ring and spiral coarse outlet path combine for the sharpest cut-point available.