US PATENT SUBCLASS 454 / 8
.~.~ Inlet and outlet

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}
8.~.~ Inlet and outlet {1}
9  DF  .~.~.~> Having air current responsive adjustment means (e.g., wind vane, etc.)

DEFINITION

Classification: 454/8

Inlet and outlet:

(under subclass 3) Subject matter comprising separate passages for directing air or products of combustion to and from the ventilated space.

SEE OR SEARCH THIS CLASS, SUBCLASS:

103+, for a railcar, bus, or trailer having both inlet and outlet airways.

141+, for other vehicles having both inlet and outlet airways.

237+, for static structures (e.g., buildings) having both inlet and outlet airways, particularly, subclass 242, for a rooftop, unitary inlet and outlet housing having both inlet and outlet airways, which housing is not associated with a chimney or stack.