#ventilator  a device (such as a fan) that introduces fresh air or expels foul air
  supertype:  device  an instrumentality invented for a particular purpose; "the device is small enough to wear on your wrist"; "a device intended to conserve water"
  part of:  ventilation_system
  part:  air_filter__airfilter__aircleaner  removes dust from air that passes through it

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