Abstract: A mining machine of the type comprising a body, a driven cutter mounted on the body, and an air-cleaning system comprising ducting for conducting dust-laden air, a scrubber for applying liquid to the dust-laden air, and a demister for thereafter removing moisture from the air. The demister comprises a moisture separating station having a flow inlet, a flow outlet located rearwardly of the flow inlet, and moisture separating louvers forming air channels which receive air flow from the inlet and causing moisture in the air flow to separate-out and gravitate toward a lower collecting surface to be conducted rearwardly. A moisture accumulating section is located adjacent a rearward end of the collecting surface to receive the rearwardly conducted moisture. The accumulating section includes a floor, an end wall, a top wall, and a forwardly facing entrance for admitting the moisture.