Checks if given type is valid flexible duct type. 
   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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Parameters
- document
 -  Type:  Autodesk.Revit.DB Document  
The document. 
- ductTypeId
 -  Type:  Autodesk.Revit.DB ElementId  
ElementId of the flexible duct type to check. 
Return Value
True if flexible duct type can used for this duct, false otherwise.Remarks
 A type is valid for flexible duct if it can be used to the flexible duct element. 
 Exceptions
| Exception | Condition | 
|---|---|
| Autodesk.Revit.Exceptions ArgumentNullException | A non-optional argument was NULL |