#air_filter__airfilter__aircleaner  removes dust from air that passes through it
  supertype:  #filter  device that removes something from whatever passes through it
  subtype:  #filter_tip  an air filter on the end of a cigarette; contains material that filters the smoke
  part of:  #ventilator  a device (such as a fan) that introduces fresh air or expels foul air
     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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