Back draft for exhaust fans and hoods

Details Back draft for exhaust fans and hoods Back draft for exhaust fans and hoods

1977-04-19

1978-06-13

Nilson, Robert G.

Fluid handling

Line condition change responsive valves

Direct response valves

F16K 1503

Patent

active

040943364

ABSTRACT:
A back draft damper for exhaust fans and hoods such as those used in kitchens or bathrooms; the damper comprising a stationary valve plate having a pair of openings and an elongate slot between said openings with a pair of flapper valve plates having curved edge portions extending through said slot and forming pivotal mounting for said flapper valve plates on said stationary valve plate; said flapper valve plates having extremities overlapping said openings in said stationary valve plate; the flapper valve plates being openable by air under pressure and closeable by gravity, and being on an upper surface of said stationary valve plate.

REFERENCES:
patent: 3009475 (1961-11-01), Richterkessing
patent: 3171343 (1965-03-01), Wexler
patent: 3445863 (1969-05-01), Wada

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