Drainage, Waste & VentQuestion 160 of 360
What distinguishes an 'air break' from an 'air gap' in an indirect waste installation?
a.They are identical terms
b.An air break always has a larger separation than an air gap
c.An air gap allows the indirect pipe to be submerged
d.An air break lets the indirect pipe terminate below the receptor's flood-level rim (the pipe may touch the receptor), while an air gap keeps a physical separation above the flood-level rim
Explanation
An air gap is an unobstructed vertical separation above the flood-level rim of the receptor, giving full protection against back-siphonage. An air break allows the indirect drain to end below the flood-level rim, even touching the receptor, but not submerged. Higher-hazard equipment (like food equipment) requires the full air gap, while lower-hazard drains may use an air break.
Law Reference: 2022 California Plumbing Code (CPC) §801.0Practice all 360 questions free — no signup required.
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