THM type For short conveyor up to 12 m (suction and pressure pipe). THM-D type The enhanced blower ensures that the goods to be milled are sucked up over long distances and that the feed is conveyed over long distances to the point of consumption. The maximum conveyor distance is 50 m (suction and pressure pipe). THM-DS Type An even stronger blower is incorporated in an even larger milling casing, which enables systems with a total pipe length of up to 80 m.