We’ve discussed this in a few threads. Seems that length and area (and what else?) are converted to the RVT’s current unit settings in Dynamo but other units remain as Revit internal units. See Revit API MEP Units & Conversion
We’ve discussed this in a few threads. Seems that length and area (and what else?) are converted to the RVT’s current unit settings in Dynamo but other units remain as Revit internal units. See Revit API MEP Units & Conversion