This is how we do it, your code may or maynot be like this, you will need to know your codes, here each fixtures requires a vent for each fixture, one for toilet, shower and lav, then they can all connect to one vent, min vent size for toilet 2"
If your adding, get a permit and have the proper inspections, this way you know it meets code requiremenrs.
Fix it right the first time, so you won't have to fix it a 2nd time.
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