(under the class definition) Structure including tubular means guiding gaseous products, a specific building structure and connecting means therebetween.
SEE OR SEARCH THIS CLASS, SUBCLASS:
218+, for flue structures combined with a gaseous fluid director there provided for.
SEE OR SEARCH CLASS
285, Pipe Joints or Couplings,
42+, for a combined flue and roof flashing, per se.
