a. An arrangement of a number of major ventilation systems serving various large working areas and served by more than two shafts and their associated fans, but integrated to form one ventilation system. Usually adopted in large combined mines. See also: radial ventilation BS, 8
b. Ventilation by means of a number of splits, which is now normal practice. See also: ventilation
Source:
Dictionary of Mining, Mineral, and Related Terms












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