The duct/pipe has been modified to be in the opposite direction causing the connections to be invalid.

Namespace: Autodesk.Revit.DB
Assembly: RevitAPI (in RevitAPI.dll) Version: 24.0.0.0 (24.0.0.0)

Syntax

C#
`public static FailureDefinitionId DuctPipeModified { get; }`

Visual Basic
`Public Shared ReadOnly Property DuctPipeModified As FailureDefinitionId Get`

Visual C++
`public: static property FailureDefinitionId^ DuctPipeModified { FailureDefinitionId^ get (); }`

See Also