Duct for a toilet bowl ventilation system

The ornamental design for a duct for a toilet bowl ventilation system, as shown and described.

FIG. 1 is a perspective view of a duct for a toilet bowl ventilation system showing my new design from the top, one end, and one side; and,

FIG. 2 is a perspective view thereof shown from the bottom, and end and side opposite that shown in FIG. 1.

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7987527,	Dec 14 2004		Toilet ventilation device
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Patent	Priority	Assignee	Title
3153794,
3849808,
D269117,	Dec 18 1980		Ventilation conduit for toilets
D271329,	Aug 01 1980	LDI MFG CO , INC ,	Fresh air duct for a kitchen exhaust system
D307568,	Nov 04 1987		Vehicle roof mounted air reversing unit

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