US PATENT SUBCLASS 454 / 20
.~.~ Having air current responsive adjustment means

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.~.~ Having air current responsive adjustment means {2}
21  DF  .~.~.~> Wind vane {3}
26  DF  .~.~.~> Current regulator

DEFINITION

Classification: 454/20

Having air current responsive adjustment means:

(under subclass 3) Subject matter comprising a means which alters the position or operation of the structure or a part thereof in reaction to a change in (1) flow of natural air (i.e., wind) or (2) flow of air or products of combustion

through the vertical conduit section.

SEE OR SEARCH THIS CLASS, SUBCLASS:

9, for an air current responsive adjustment means associated with chimney or stacktop structure which includes both an inlet and outlet to a ventilated space.

11, for an air current responsive adjustment means associated with chimney or stacktop structure which includes an inlet only (no claimed outlet) to a ventilated space.

17, for an air current responsive adjustment means associated with chimney or stacktop structure which includes a rotary means in the air current (e.g., fan etc.).