Fire smoke damper

Details Fire smoke damper Fire smoke damper

1975-01-15

1976-09-14

Blunk, Evon C.

Valves and valve actuation

Rotary valves

Butterfly

169 48, 277161, F16K 1228

Patent

active

039802728

ABSTRACT:
A fire and smoke damper for installation in a duct which includes a plate rotatably mounted within the duct and having means enclosing the periphery of the plate and biased outwardly to engage the duct wall when the damper is in the closed position.

REFERENCES:
patent: 1903107 (1933-03-01), Grant
patent: 3384340 (1968-05-01), Fawkes
patent: 3552407 (1971-01-01), Hirano
patent: 3554216 (1971-01-01), Piguet
patent: 3586290 (1971-06-01), Null
patent: 3633872 (1972-01-01), Wright

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