A flex duct type in the Autodesk Revit MEP product. 
   Namespace:   Autodesk.Revit.DB.Mechanical  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 2015.0.0.0 (2015.0.0.0) 
Syntax
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Remarks
 The flex duct type is only available in the Autodesk Revit MEP product. 
 Inheritance Hierarchy
  System Object  
Autodesk.Revit.DB Element
Autodesk.Revit.DB ElementType
Autodesk.Revit.DB HostObjAttributes
Autodesk.Revit.DB MEPCurveType
Autodesk.Revit.DB.Mechanical FlexDuctType
 
 Autodesk.Revit.DB Element
Autodesk.Revit.DB ElementType
Autodesk.Revit.DB HostObjAttributes
Autodesk.Revit.DB MEPCurveType
Autodesk.Revit.DB.Mechanical FlexDuctType