US PATENT SUBCLASS 454 / 26
.~.~.~ Current regulator

Current as of: June, 1999
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454 /   HD   VENTILATION

1  DF  CHIMNEY OR STACK {6}
3  DF  .~ Chimneytop or stacktop structure (e.g., cowl) {12}
20  DF  .~.~ Having air current responsive adjustment means {2}
26.~.~.~ Current regulator

DEFINITION

Classification: 454/26

Current regulator:

(under subclass 20) Subject matter wherein the means varies flow of air or products of combustion through the vertical conduit section.

SEE OR SEARCH THIS CLASS, SUBCLASS:

27, for a current regulator which is not air current responsive.

SEE OR SEARCH CLASS

126, Stoves and Furnaces,

285+, for a flow regulating damper, per se.