MS Residential HVAC Practice Questions - Mississippi Residential HVAC Contractor Examination Exam

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Compared with external duct wrap, internal fibrous duct liner is primarily selected on a residential job when the designer also needs which performance feature?

A vapor retarder on the warm side of a cooling duct A higher UL 181 listing than wrap can provide Sound absorption in the air stream plus some thermal resistance A substitute for sealing longitudinal seams

Correct Answer:

Sound absorption in the air stream plus some thermal resistance

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