mine ventilating fan

mine ventilating fan

[′mīn ′vent·əl‚ād·iŋ ‚fan]
(mining engineering)
A motor-driven disk, propeller, or wheel for blowing or exhausting air to provide ventilation of a mine; large units are used for stationary systems, while small portable types provide fresh air in inaccessible locations, such as dead ends.
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