#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:  air_filter
  part of:  ventilation_system__ventilationsystem__ventilating_system__ventilatingsystem  a mechanical system in a building that provides fresh air; "she was continually adjusting the ventilation"

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