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

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A roof-drain isometric shows one primary drain serving 2,500 square feet at 4 inches per hour. The computed flow is 104 gpm. Using Table 1106.2, what is the smallest vertical leader that may serve that drain?

2 inches (34 gpm vertical) 3 inches (87 gpm vertical) 4 inches (180 gpm vertical) 5 inches (311 gpm vertical)

Correct Answer:

4 inches (180 gpm vertical)

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