An enumerated type listing all the possible duct system types for a connector object. 
   Namespace:   Autodesk.Revit.DB.Mechanical  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 21.0.0.0 (21.1.1.109) 
  Since:  2012 
Syntax
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Members
| Member name | Description | 
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| UndefinedSystemType | Undefined system type. | 
| SupplyAir | Duct System Type is SupplyAir. | 
| ReturnAir | Duct System Type is ReturnAir. | 
| ExhaustAir | Duct System Type is ExhaustAir. | 
| OtherAir | Duct System Type is OtherAir. | 
| Fitting | Duct System Type is Fitting. | 
| Global | Duct System Type is Global. |