US PATENT SUBCLASS 454 / 22
.~.~.~.~ With air current inducing jet

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}
21  DF  .~.~.~ Wind vane {3}
22.~.~.~.~ With air current inducing jet {1}
23  DF  .~.~.~.~.~> Centered within induced air current

DEFINITION

Classification: 454/22

With air current inducing jet:

(under subclass 21) Subject matter comprising a nozzle which ejects a high velocity flow stream to cause air or products of combustion to flow through the vertical conduit section.

(1) Note. The high velocity flow stream is usually diverted natural air current (i.e., wind).

SEE OR SEARCH THIS CLASS, SUBCLASS:

39+, for other chimney or stacktop structures which use current inducing jets to induce flow in the outlet airway.

116, for a railcar, bus, or trailer which uses a current inducing jet (often wind caused by the movement of the vehicle) to induce flow in the outlet airway.

163, for other vehicles which use a current inducing jet (often wind caused by the movement of the vehicle) to induce flow in the outlet airway.