US PATENT SUBCLASS 454 / 25
.~.~.~.~ Hood having outlet opening perpendicular to wind

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}
25.~.~.~.~ Hood having outlet opening perpendicular to wind

DEFINITION

Classification: 454/25

Hood having outlet opening perpendicular to wind:

(under subclass 21) Subject matter wherein the structure comprises a cover means over the opening in the vertical conduit's uppermost section, the cover means rotating to maintain an air or products of combustion exhaust opening therein facing at a right angle to the natural air flow direction.