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SC Plumber Contractor Practice Questions - South Carolina Plumber Contractor Examination Exam

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A 4-inch soil stack serving 140 DFU has a stack vent with 40 feet of developed length to open air. Using Table 906.1, and remembering the vent cannot be smaller than one-half the drain served, what is the minimum stack-vent size?
Correct Answer:
2-1/2 inches

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