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

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A crew pulls R-8 flex duct tight through attic trusses so the insulation jacket is compressed to about half its manufactured thickness for most of a 20-foot run. What is the primary thermal result?

R-value stays the same because the jacket label still reads R-8 Installed R-value drops because compressed glass fiber has less trapped air R-value increases because the thinner jacket reduces heat-transfer area Only fire rating is affected; thermal resistance is unchanged

Correct Answer:

Installed R-value drops because compressed glass fiber has less trapped air

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