Other then being a code requirement is there a reason why a plumbing system in a building needs at least one vent to the outside of the building and why not use a sufficient number of Air Admitt?

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waste management vs bacteria storage To facilitate the minimum [gravity flow] activity for any type of liquid transfer application(s), [in this case, waste management], one vent will allow liquid movement to begin. Supplying one vent per fixture installed promotes the best fluid (waste) movement results; hence, going through the roof.... "Trial and error" experience has proven that unless some sort of gravity system is created to support the process, either a unsafe vacuum system will be created or a bottle-neck system will result which could be followed by many more headaches than desired, meaning your liquid flow system will be so inefficient that bacteria storage will be the outcome rather than waste management.
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If your stench pipe terminates inside the building how can the system be vented?

I haven't heard it called THAT before. Most of the time it's called a "vent" pipe. Anyway, they typically vent to the outside, straight up through the roof. Anything else is i

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