exhaust fan

exhaust fan

noun
a fan for ventilating an interior by drawing air from the interior and expelling it outside.

Origin:
1870–75
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Exhaust fan is always a great word to know.
So is quincunx. Does it mean:
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
WordNet
exhaust fan

noun
a fan that moves air out of an enclosure 
WordNet® 3.0, © 2006 by Princeton University.
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