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Vent stack
A vent stack is a pipe that lets air into the plumbing system so drains flow smoothly without siphoning traps.
Why it matters
Good venting prevents gurgling drains, slow drainage, and sewer odors.
Where people get this wrong
A drain and a vent do different jobs. The vent is about air, not water. A gurgling sink can point to a venting issue, not a clog.
Real-world example
You drain a tub and the nearby sink makes a loud gulp sound. That is often the system begging for air because venting is wrong.
Where this hits your build
This comes up during rough-in and final fixture installation. Accessibility for future repairs matters as much as the initial install.
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