SC Air Conditioning Practice Questions - South Carolina Air Conditioning Contractor Examination Exam

Metallic underground ducts that do not have an approved protective coating must be:

Laid in bare soil with no slope Completely encased in not less than 2 inches of concrete and sloped at least 1/8 inch per foot to an accessible drain point Wrapped only with duct tape Used as a combustion-air duct without sealing

Correct Answer:

Completely encased in not less than 2 inches of concrete and sloped at least 1/8 inch per foot to an accessible drain point

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