SC Heating Practice Questions - South Carolina Heating Contractor Examination Exam

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Metallic underground ducts that do not have an approved protective coating shall be completely encased in not less than how much concrete, and the duct shall have what minimum slope?

1 inch of sand; no slope 2 inches of concrete; minimum slope 1/8 inch per foot to an accessible drain point 6 inches of concrete; 1 inch per foot No encasement if the duct is galvanized, and a reverse slope toward the unit

Correct Answer:

2 inches of concrete; minimum slope 1/8 inch per foot to an accessible drain point

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