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EERE » BTO » Building America » Solution Center Home » 6.3 All supply and return ducts in unconditioned space, including connections to trunk ducts, are insulated to ≥ R-6

6.3 All supply and return ducts in unconditioned space, including connections to trunk ducts, are insulated to ≥ R-6

The following Solution Center guides provide specific guidance for supply and return ducts in unconditioned space:

Sealed and Insulated Flex Ducts
Sealed and Insulated Fiber Board Ducts