US PATENT SUBCLASS 431 / 20
.~ Of or by exhaust damper or exhaust pump

Current as of: June, 1999
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431 /   HD   COMBUSTION

18  DF  TIMER, PROGRAMMER, RETARDER OR CONDITION RESPONSIVE CONTROL {26}
20.~ Of or by exhaust damper or exhaust pump

DEFINITION

Classification: 431/20

(under subclass 18) Apparatus in which (1) a pump or flow controller in a line by which combustion products are removed from a combustion chamber is controlled or (2) a means responsive to the position or condition of operation of such a pump or flow controller exerts a control.

SEE OR SEARCH CLASS

110, Furnaces,

147+, for a draft regulator for a solid fuel furnace.

126, Stoves and Furnaces,

285+, for a cooking stove damper and its operator.

236, Automatic Temperature and Humidity Regulation, 45, for the regulation of temperature by means controlling the draft of a heater.