Exhaust fan apparatus

Details Exhaust fan apparatus Exhaust fan apparatus

1994-11-15

1995-08-08

Look, Edward K.

Rotary kinetic fluid motors or pumps

Working fluid passage or distributing means associated with...

Scroll or helical type casing with specific exit nozzle

454 3, 417198, F04D 2944

Patent

active

054393493

ABSTRACT:
An exhaust fan to be mounted on a roof and for exhausting spent gases from a building, including a centrifugal fan scroll casing with a centrifugal fan impeller mounted on an axle within the casing and having an axis of rotation at right angles to the side members of the scroll casing. A bifurcated stack including two generally parallel passageways is connected to the scroll casing so that the stack is upright and communicates with the outlet port of the scroll casing. A ring defining an annulus may be provided at the outlet end of the stack to induce ambient air to mix with the spent air exhausting from the bifurcated tubular member.

REFERENCES:
patent: 352597 (1886-11-01), Wohlfert
patent: 2265112 (1941-12-01), Davies
patent: 3385197 (1968-05-01), Greber
patent: 3719032 (1973-03-01), Cash
patent: 3797373 (1974-03-01), Larson
patent: 4806076 (1989-02-01), Andrews

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