US PATENT SUBCLASS 454 / 16
.~.~.~ Driven by external power source

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}
16.~.~.~ Driven by external power source

DEFINITION

Classification: 454/16

Driven by external power source:

(under subclass 15) Subject matter wherein the member is unidirectionally rotated by a means other than (1) flow of natural air (i.e., wind) or (2) flow of air or products of combustion through the vertical conduit section.

(1) Note. The means to unidirectionally rotate the member is commonly an electric or pneumatic motor.