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EERE » BTO » Building America » Solution Center Home » 6.1 Ductwork installed without kinks, sharp bends, compressions, or excessive coiled flexible ductwork.

6.1 Ductwork installed without kinks, sharp bends, compressions, or excessive coiled flexible ductwork.

See the following guides for relevant information.

No Kinks or Sharp Bends in Flex Duct Installation
No Excessive Coiled or Looped Flex Ducts
Sufficient Cavity Space for Flex Ducts