US PATENT SUBCLASS 110 / 304
.~.~.~ Remote from combustion chamber

Current as of: June, 1999
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110 /   HD   FURNACES

297  DF  INCLUDING NONCOMBUSTIBLE FLUID SUPPLY MEANS {3}
301  DF  .~ Having treatment means {2}
302  DF  .~.~ Preheater {5}
304.~.~.~ Remote from combustion chamber

DEFINITION

Classification: 110/304

Remote from combustion chamber:

(under subclass 302) Apparatus wherein the preheater is located such that it receives its heat from the combustion chamber exhaust gases, but the preheater is external to the combustion chamber.

SEE OR SEARCH CLASS

432, Heating,

179+, for a heated work chamber provided with exhaust preheater means.