US PATENT SUBCLASS 110 / 205
.~.~ Air supply means

Current as of: June, 1999
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110 /   HD   FURNACES

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

DEFINITION

Classification: 110/205

Air supply means:

(under subclass 204) Apparatus provided with means for introducing air into the combustion products being returned to the combustion chamber.