US PATENT SUBCLASS 110 / 204
.~ Recirculation means

Current as of: June, 1999
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110 /   HD   FURNACES

203  DF  WITH EXHAUST GAS TREATMENT MEANS {5}
204.~ Recirculation means {1}
205  DF  .~.~> Air supply means {1}

DEFINITION

Classification: 110/204

Recirculation means:

(under subclass 203) Apparatus wherein the conditioning means returns all or part of the products of combustion to a combustion chamber.

SEE OR SEARCH CLASS

126, Stoves and Furnaces,

79, for a heating stove provided with means for returning the combustion products to the combustion chamber.

266, Metallurgical Apparatus,

156, for metallurgical treating apparatus provided with exhaust gas recycling means.

431, Combustion,

115+, for fluid fuel burners provided with exhaust gas recirculation means.