#flue  a conduit to carry off smoke
  supertype:  #conduit__channel  a passage for water (or other fluids)
  subtype:  #chimney  a vertical flue that provides a path through which smoke from a fire is carried away through the wall or roof of a building
     subtype:  #smokestack__stack  a large tall chimney through which combustion gases and smoke can be evacuated
        subtype:  #funnel  smokestack consisting of a shaft for ventilation or the passage of smoke (especially the smokestack of a ship)
     subtype:  #stovepipe  chimney consisting of a metal pipe of large diameter that is used to connect a stove to a flue
  subtype:  #chimneystack  the part of the chimney that is above the roof; usually has several flues
  subtype:  #lamp_chimney__chimney  a glass flue surrounding the wick of an oil lamp

No statement uses or specializes #flue; click here to add one.