your mill has three de Laval (hourglass-shaped) air nozzles, each with a 10-millimeter orifice, and the compressed-air supply is at 85 psig, the airflow from the nozzles totals about 666 scfm. Additional airflow typically includes another 12 scfm for purging the mill's bearings and 70 scfm to purge the classifier wheel's gap (the narrow
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