The length unit to be used if not specified when the input is a unitless SAT file. 
   Namespace:   Autodesk.Revit.DB  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 22.0.0.0 (22.1.0.0) 
  Since:  2017 
Syntax
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Remarks
 If the input is a unitless SAT file then this length unit will be used as a backup.