Gets the list of specific fitting angles. 
   Namespace:   Autodesk.Revit.DB.Mechanical  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 2015.0.0.0 (2015.0.0.0) 
  Since:  2014 
Syntax
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Return Value
Angles (in degrees).Remarks
 Revit will only use the angles specified during the pipe layout or modifying the pipe layout. When laying out the pipes, if the angle between two pipes is close to the allowed angle, the specific angle is used for that pipe fitting.