US PATENT SUBCLASS 165 / DIG 128
.~.~.~ Including air draft passage for heating ambient air


Current as of: June, 1999
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165 /   HD   HEAT EXCHANGE

DIG 92  DD  WITH VALVE OR MOVABLE DEFLECTOR FOR HEAT EXCHANGE FLUID FLOW {6}
DIG 126  DD  .~ Total flow rate through heat exchanger controlled by valve {3}
DIG 127  DD  .~.~ Stove pipe drum {1}
DIG 128.~.~.~ Including air draft passage for heating ambient air