Crossover Duct Repair or Replacement

Remove previously existing duct materials from installation area that are damaged or wet

Prepare trunk surface to accept new installation and sealants

Use only rigid ducts of 26 gauge or greater for crossover connections in subspaces (i.e., crawlspaces, belly area)

In attics, if sufficient space is not available for rigid duct installation, UL 181 approved flexible duct may be used

Install a rigid metal transition (e.g., rigid elbow) for all changes in airflow direction that is the same size as the crossover duct and is positioned towards the direction of flow

Fasten duct connections in accordance with SWS detail "Duct Repair: Mechanical Fastening"

Support ducts in accordance with SWS detail "Duct Repair: Duct Support"

Install insulation to a minimum of R-8 that includes a vapor retarder layer

Seal all crossover ducts in accordance with SWS Subtopic "Duct Sealing"