Duct   |  
 The roughness of Duct Lining. 
 Namespace: Autodesk.Revit.DB.Mechanical
Assembly: RevitAPI (in RevitAPI.dll) Version: 25.0.0.0 (25.0.0.0)
| Exception | Condition | 
|---|---|
| ArgumentOutOfRangeException | When setting this property: The roughness value should be at least equal to or larger than 0. |