Drainage, Waste & VentQuestion 86 of 360
Horizontal vent piping must be graded so that it:
a.Runs perfectly level
b.Drains any condensate back to the drainage pipe by gravity
c.Slopes away from the drainage system
d.Is installed only vertically
Explanation
Horizontal vent pipes must maintain a slope back toward the drainage piping so condensate and any moisture drain back by gravity and do not pool inside the vent. A level or reverse-sloped vent allows water to collect and block airflow. Vents are not restricted to vertical runs.
Law Reference: 2022 California Plumbing Code (CPC) §905.0Practice all 360 questions free — no signup required.
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