US PATENT SUBCLASS 110 / 305
.~.~.~ Bridgewall


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}
305.~.~.~ Bridgewall


DEFINITION

Classification: 110/305

Bridgewall:

(under subclass 302) Apparatus further provided with a hollow

barrier structure located at the rear of the fire grate attached to the preheater such that the heated fluid enters the combustion reaction from barrier structure.