Building America Solution Center

Guides

Back-Draft Dampers at Shared Common Exhaust Duct

Building Cavities Not Used as Supply or Return Ducts

Common Exhaust Duct Not Shared by Fans in Separate Dwellings

Duct Leakage to Outdoors

HVAC Ducts Shall Not Be Run within Exterior Walls

Insulation Levels for Ducts in Unconditioned Spaces

Jump Ducts

No Excessive Coiled or Looped Flex Ducts

No Kinks or Sharp Bends in Flex Duct Installation

Sealed and Insulated Fiber Board Ducts

Sealed and Insulated Flex Ducts

Sealed and Insulated Metal Ducts

Sufficient Cavity Space for Flex Ducts

Support at Intervals for Flex Ducts

Total Duct Leakage

Transfer Grilles