a person or thing that ventilates.
a contrivance or opening for replacing foul or stagnant air with fresh air.
Medicine/Medical. a respirator.

1735–45; ventilate + -or2 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
ventilator (ˈvɛntɪˌleɪtə)
1.  an opening or device, such as a fan, used to ventilate a room, building, etc
2.  med a machine that maintains a flow of air into and out of the lungs of a patient who is unable to breathe normally

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Nevertheless, earlier this year he decided that he wanted to die, and demanded
  that his ventilator be turned off.
He was given a flood of antibiotics and put on a ventilator, but within six
  days he was dead.
He napped briefly with his feet clipped to the pedals and the ventilator over
  his face.
The surgeons opened a hole in her throat so she could breathe on a ventilator
  while she slept.
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