ventilator

/V EH1 N T AH0 L EY0 T ER0/
noun
  1. 1

    A device that circulates fresh air and expels stale or noxious air.

  2. 2

    A machine that moves breathable air into and out of the lungs of a patient who is unable to breathe sufficiently.

  3. 3

    A play or an actor so bad as to empty the theater.

Source: https://en.wiktionary.org/wiki/ventilator