Barometric damper apparatus

Details Barometric damper apparatus Barometric damper apparatus

1992-12-21

1994-01-11

Joyce, Harold

Ventilation

Having inlet airway

Including backdraft preventer

1375121, 454360, F24F 1314

Patent

active

052776581

ABSTRACT:
Barometric damper apparatus is usable for both horizontal air flow and vertical air flow and thus comprises a universal barometric damper apparatus without a structural change. The barometric damper apparatus includes a plurality of louvers or damper blades pivotly secured to a frame and which pivot to the closed position under gravity when air stops flowing. Each louver includes a relatively short upstream portion and a relatively long downstream portion, with the relatively short upstream portion including a counterweight which causes the relatively short upstream portion to be heavier than the relatively long downstream portion so that the louver apparatus pivots to the closed position with the relatively short upstream portion always moving downwardly. A bend in the relatively long downstream portion allows the louver to contact the adjacent louver in the closed position so as to provide a seal to prevent air from leaking back through the damper apparatus.

REFERENCES:
patent: 3204548 (1965-09-01), McCabe

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