4.1 All in-unit heating and cooling distribution ducts and in unit heating and cooling air-handling equipment are located within the thermal and air barrier boundary.

See the following guides for relevant information.

Ducts Buried in Attic Insulation and Encapsulated

Encapsulated Ducts

Ducts Buried in Attic Insulation

Unvented Attic Insulation

Unvented, Insulated Crawlspaces

Unvented Conditioned Attic with Spray Foam Insulation Below Roof Deck

Ducts in Dropped Ceilings

Ducts in Raised Ceiling Sections

No Ducts or Air Handlers Located in Garage

Ducts in Interstitial Floor Framing