Bauermeister wind classifiers are operating according to the principle of the so-called paddle-wheel classifiers and are suited for the classification of dry fine and superfine powders and are used when the technical options of sieve machines do longer suffice. The wind classifier is equipped with two separating zones, a fine product classification zone comprising a quickly rotating classification wheel as well as a coarse product classification zone as a subsequent dispersing stage. The type series comprises 7 different sizes and can be used as grinding classification units in combination with universal grinders.