US PATENT SUBCLASS 110 / 300
.~.~.~ For forced air supply

Current as of: June, 1999
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110 /   HD   FURNACES

297  DF  INCLUDING NONCOMBUSTIBLE FLUID SUPPLY MEANS {3}
298  DF  .~ Hollow grate {1}
299  DF  .~.~ Having flow controller {1}
300.~.~.~ For forced air supply

DEFINITION

Classification: 110/300

For forced air supply:

(under subclass 299) Apparatus wherein the flow control means is an impeller fan.