Exhaust fan apparatus

F - Mech Eng,Light,Heat,Weapons – 04 – D

Patent

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Details

F04D 29/40 (2006.01) F04D 25/08 (2006.01) F04D 29/42 (2006.01) F24F 7/06 (2006.01)

Patent

CA 2140163

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 hav- ing an axis of rotation at right angles to the side members of the scroll casing. A bifurcated stack including two generally parallel passageways is con- nected 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 pro- vided at the outlet end of the stack to induce ambient air to mix with the spent air exhausting from the bifurcated tubular member.

Cette invention concerne un ventilateur d'extraction monté en toiture et servant à évacuer l'air vicié d'un bâtiment. Il comprend une enveloppe à spirale et une roue à aubes centrifuge tournant autour d'un axe perpendiculaire aux côtés de l'enveloppe à spirale. Une cheminée d'évacuation bifurquée verticale comportant deux branches généralement parallèles est montée sur l'enveloppe du ventilateur en communication directe avec l'orifice de sortie de cette dernière. Un manchon annulaire peut être monté en bout de cheminée pour favoriser le mélange de l'air ambiant avec l'air vicié sortant de la cheminée bifurquée.

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