4.2 Duct systems protected from construction debris AND no building cavities used as air supplies or returns

To comply with the Indoor airPLUS and Zero Energy Ready Home programs, duct systems must be protected from construction debris AND no building cavities can be used as air supplies or returns.

The following Solution Center Guides provide more information about these measures:

Guide describing the use of building cavities as supply or return ducts.

Guide describing removal of construction debris from flex ducts and protection of ducts and HVAC equipment during construction to keep them free of dust and debris.