Classifiers are used for speration of dust materials. This kind of dynmic classifiers are using for separate from 40 µm to 800 µm, for over 800 µm should use vibratory screen etc. Efficiency of the classifier is up ot 85%. It’s maen that there is 100 unit material in the feeding material which is we focused for separate. The classifier could separate 85% of the 100 unit and 15% fine material going to go to with coarse materials.