NV C-21C Sheet Metal Practice Questions - Nevada C-21C Sheet Metal Contractor Examination Exam

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Why is lock-forming-quality galvanized steel the usual material for low-pressure HVAC supply and return ducts under UMC 2018 Chapter 6?

It is listed as a Type I grease-duct metal without welding It forms Pittsburgh and snap-lock seams, resists ordinary indoor corrosion, and meets SMACNA HVAC Duct Construction Standards It is approved as a clothes-dryer exhaust liner without joints It may be used as a masonry chimney flue liner without listing

Correct Answer:

It forms Pittsburgh and snap-lock seams, resists ordinary indoor corrosion, and meets SMACNA HVAC Duct Construction Standards

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