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

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SMACNA/ACCA practice prefers rectangular duct aspect ratios near 2:1 and generally not exceeding about 4:1 because a very flat duct:

Has less metal and less friction than a round duct of equal capacity Uses more metal, has more friction, and is harder to stiffen than a near-square or round duct of the same cfm Cannot be insulated Automatically becomes a grease duct

Correct Answer:

Uses more metal, has more friction, and is harder to stiffen than a near-square or round duct of the same cfm

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