#venthole__vent__blowhole  a hole for the escape of gas or air
  supertype:  #hole  an opening deliberately made in or through something
  subtype:  #smoke_hole  a vent (as in a roof) for smoke to escape
  part of:  #air_passage__airpassage__air_duct__airduct__airway  a duct that provides ventilation as in mines

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