(under the class definition) Structure comprising tubular means confining gaseous products and including means directing a gaseous fluid (air or other gas) therein to or therefrom.
SEE OR SEARCH CLASS
110, Furnaces,
184, for a metal smokestack peculiar to solid fuel burning furnaces.
126, Stoves and Furnaces,
500+, for a flue construction including a fireplace and subclasses 307+ for a stovepipe peculiar to that class. 454, Ventilation,
1+, for a chimney or stack which conducts air or products of combustion between a ventilated space and the surrounding environment.
