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Each fixture should be vented no more 3 ft away from that fixture.
1 1/2 inch vent for tub and sinks and 2 inch vents for toilet.
These can all tie together at a point above the highest fixture, usually the sink then this line called the vent stack, usually 3 inch can tie into an existing vent stack above all other fixtures in house in atic or brought out by itself.
Gerry
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