A hammer mill that releases a cloud of fine dust into the room is a hygiene problem and a product loss at the same time. The 30B dust free crushing set solves both by integrating three functions in one frame: a feed hopper, a high speed crushing chamber and a dedicated dust collection fan. Material enters the chamber, is broken by the rotating hammers against a screen, and the fines are drawn into a collection box instead of escaping into the production room, so the operator