A method of supplementing the main ventilating current in a mine by using
a small fan to draw air from the main current and force it through canvas
or metal pipe to some particular place, such as the ends of drifts,
crosscuts, raises, entries, or other workings driven in a mine.
See also: air mover;
forced auxiliary ventilation; overlap auxiliary ventilation; piped air;
reversible auxiliary ventilation; two-fan auxiliary ventilation.
Dictionary of Mining, Mineral, and Related Terms