(under the class definition) Apparatus having a cooling or absorbing surface over which gaseous material in or exhausting from a work heating chamber passes to condense or absorb a component of the gaseous material.
SEE OR SEARCH CLASS
34, Drying and Gas or Vapor Contact With Solids,
73+, for a drier with means treating the gas or vapor to produce condensation.
126, Stoves and Furnaces,
381+, for an open water heater having a condenser.
202, Distillation: Apparatus, appropriate subclass for a material heater having means condensing evolved vapor to produce a liquid product. 266, Metallurgical Apparatus,
144+, for a metallurgical furnace having a fume arrester.
373, Industrial Electric Heating Furnaces,
56+, for an electric furnace combined with a condenser.