Plumbing · IPC 2021 §704.2
No Drain Size Reduction in Direction of Flow
Drain piping is not reduced in the direction of flow; the 4x3 closet flange, the 4 in by 3 in closet bend with upright 4 in leg, and offset closet flanges are not reductions.. Referenced to IPC 2021 §704.2.
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