Does anyone see a problem plumbing a home this way? Do I need 1 or both of red sections as vents? All plumbing diagrams i see always show a stack vent continuing straight off of the soil stack going through the roof. If all fixtures have their own vents as shown do I need red sections. If I do need them I am curious as to why. Do you see any other problems with plumbing as shown? I have attached a picture.
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