US PATENT SUBCLASS 454 / 34
.~.~ Four-side outlets with shield

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}
34.~.~ Four-side outlets with shield

DEFINITION

Classification: 454/34

Four-side outlets with shield:

(under subclass 3) Subject matter wherein the structure comprises exhaust openings 90 degrees apart with a deflector across each opening to prevent back draft.