Mild steel opposed jet mill chamber 800 mm dia x 1,600 mm deep with 11 kw 2880 rpm belt drive with pullies to give 3,700 rpm requires 3,400 m.cu/hour compressed air and suction fan 4,110 m.cu/hr to suit particle size 1-2 micron size.  With Rotarty Classifier Wheel  Overall 1,400 mm x 1,500 mm x 3,000 mm tall. with 30 kw 2,900 rpm  extract All day Peacock fan rated 8,200 M.Cu/hr.