US PATENT SUBCLASS 432 / 192
.~.~.~ Multiple perforate wall, floor or roof for combustion feed or exit

Current as of: June, 1999
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432 /   HD   HEATING

120  DF  WORK CHAMBER HAVING HEATING MEANS {12}
159  DF  .~ Combustion products heat work by contact {19}
186  DF  .~.~ Distinct combustion chamber feeds work chamber {6}
192.~.~.~ Multiple perforate wall, floor or roof for combustion feed or exit

DEFINITION

Classification: 432/192

(under subclass 186) Apparatus in which a surface of the work chamber has a plurality of openings or passages over a substantial portion of its area so that the combustion products enter or leave the chamber over essentially the entire area of the surface.