Share Email Facebook Twitter LinkedIn DuctSizes.Count Property Count of the items contained in the collection. Namespace: Autodesk.Revit.DB.MechanicalAssembly: RevitAPI (in RevitAPI.dll) Version: 25.3.0.0 (25.3.0.0) Syntax C# public int Count { get; }Property ValueInt32 See AlsoReferenceDuctSizes ClassAutodesk.Revit.DB.Mechanical Namespace