No need to suck out dust A quarry (capacity 500 MTPH [550 STPH] ) with a very high content of silica in its rock, reduced the need for sucked air from 530 thousand m3/h to 35 thousand m3/h (19x106 ft3/h to 12x105 ft3/h), the dust content from 25 mg/m3 to 0.5 mg/m3 (9.03x10-10 lbs/in3 to 2x10-11 lbs/in3) and the noise level from 95 dB to 76 dB using …