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

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Per the energy provisions that IMC Section 604.1 points to, what is the minimum installed R-value for supply and return ducts 3 inches in diameter and larger that run in an unconditioned attic?

R-4.2 R-6 R-8 R-12

Correct Answer:

R-8

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