US PATENT SUBCLASS 454 / 17
.~.~.~ Having air current responsive adjustment means (e.g., wind vane, etc.)

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}
15  DF  .~.~ With rotary means in air current (e.g., fan, etc.) {3}
17.~.~.~ Having air current responsive adjustment means (e.g., wind vane, etc.)

DEFINITION

Classification: 454/17

Having air current responsive adjustment means (e.g., wind

vane, etc.):

(under subclass 15) 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.