US PATENT SUBCLASS 236 / 11
.~ Air and fire control

Current as of: June, 1999
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236 /   HD   AUTOMATIC TEMPERATURE AND HUMIDITY REGULATION

10  DF  HOT-AIR FURNACE {1}
11.~ Air and fire control

DEFINITION

Classification: 236/11

(under subclass 10) Subject matter in which the fire and also the flow of the heating air through the air chamber of the furnace is controlled.