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4 inch iit is... Thanks everybody for the help. Since I have to have at least a 3 inch vent, then I will plan on using 4 inch throughout, just to be safe.

I am trying to plan the finishing of my two story addition. I live in Washington state so I am assuming this falls under the guidelines of the UPC. What I want to do is have a laundry room w/shower, sink and john on the first floor. Opposite this, there will be a kitchen with a sink...