vent size for toilet?

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mailman62

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new bath construction and not sure what size vent thru roof is required, will be 3in drain running horizontal in crawl space live in ri if that matters.
 
1 1/2" if individually venting...2" if wet venting...if that vent goes thru the roof, must increase to 3" if you are in a cold climate.

That's my code of course. Without knowing your location, it's kind of hard to give you concrete answers
 

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