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AZ ROC C-45 Sheet Metal Practice Questions - Arizona ROC C-45 Sheet Metal Examination Exam

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A technician is replacing a 24-inch wide by 12-inch deep rectangular duct with an equivalent round duct. Using the standard equivalent-diameter formula De = 1.30 x (a x b)^0.625 / (a + b)^0.25, what is the approximate equivalent round duct diameter?
Correct Answer:
18 inches

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