Returns the face of the bounding element. 
   Namespace:   Autodesk.Revit.DB  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 2015.0.0.0 (2015.0.0.0) 
  Since:  2012 
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Return Value
The face of the bounding element.Remarks
 Applies only if the options chosen for the extraction of the element's geometry is Finish. Faces do not contain voids in room-bounding elements (such the voids in walls created by doors and windows).