US PATENT SUBCLASS 126 / 103
.~ Downdraft

Current as of: June, 1999
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126 /   HD   STOVES AND FURNACES

99 R  DF  HOT-AIR FURNACES {24}
103.~ Downdraft

DEFINITION

Classification: 126/103

(under subclass 99) Hot air furnaces in which the products of combustion are caused to pass in a downward direction through the fuel.