#ventilation_system__ventilationsystem__ventilating_system__ventilatingsystem  a mechanical system in a building that provides fresh air; "she was continually adjusting the ventilation"
  supertype:  #mechanical_system  a system of elements that interact on mechanical principles
  part:  #ventilation_shaft__ventilationshaft  a shaft in a building; serves as an air passage for ventilation
  part:  #ventilator  a device (such as a fan) that introduces fresh air or expels foul air
     part:  #air_filter__airfilter__aircleaner  removes dust from air that passes through it

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