US PATENT SUBCLASS 110 / 308
.~.~.~ Internal to or attachable to wall

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}
308.~.~.~ Internal to or attachable to wall

DEFINITION

Classification: 110/308

Internal to or attachable to wall:

(under subclass 302) Apparatus wherein the preheater means is located on the interior of or is contiguous to a sidewall of the combustion chamber.