Share Email Facebook Twitter LinkedIn SpecTypeId.DuctSize Property Duct Size, in discipline HVAC. Namespace: Autodesk.Revit.DBAssembly: RevitAPI (in RevitAPI.dll) Version: 26.2.0.0 (26.2.0.0) Syntax C# public static ForgeTypeId DuctSize { get; }Property ValueForgeTypeId See AlsoReferenceSpecTypeId ClassAutodesk.Revit.DB Namespace