An arrangement, using two auxiliary fans, for ventilating a mine tunnel or hard heading. It consists of an exhausting fan with rigid ducting to within about 100 ft (30 m) of the face, and a forcing fan using a flexible duct discharging air about 20 ft (6 m) from the face. The ducts of the two units overlap by at least 30 ft (9 m) to minimize the recirculation of air. The air delivered by the forcing fan does not exceed about one-third of that removed by the exhaust fan. See also: overlap auxiliary ventilation; auxiliary ventilation; recirculation of air; reversible auxiliary ventilation. Nelson
Source:
Dictionary of Mining, Mineral, and Related Terms












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