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The volume of the supply and return ducts and plenums shall be included where calculating the refrigerant quantity limit in the system. [ASHRAE 15:7.3.2.3]

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N1103.3.1 [RE] Energy Efficiency, (R403.3.1) Insulation (Prescriptive)
Supply and return ducts in attics shall be insulated to an R-value of not less than R-8 for ducts 3 inches (76 mm) in diameter and larger ...
R403.3.1 [RE] Residential Energy Efficiency, Insulation (Prescriptive)
Supply and return ducts in attics shall be insulated to an R-value of not less than R-8 for ducts 3 inches (76 mm) in diameter and larger ...