Indicates if to specify the setting for exporting mullions. 
   Namespace:   Autodesk.Revit.DB.Analysis  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 2015.0.0.0 (2015.0.0.0) 
  Since:  2012 
Syntax
Remarks
 When this setting is on, mullions will be exported as shading surfaces. A "simplified" analytical shading surface is produced from a mullion based on its centerline, thickness and offset.