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. 2014.
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Example sentences
Doctor, a couple of my team members want you to turn on the exhaust fan before
  starting the autopsy.
Code does not require installation of an exhaust fan if a remodel does not
  change the existing ventilation system.
The fire was believed to have originated in an exhaust fan above the vending
  machines.
Install new electric unit heater, exhaust fan and motor operating damper and
  louver for new pump house extension.
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