Mark a Revit element as an endunit
If this information is not available, or if you want to ‘force' a component to act as an endunit, you can mark components as endunits using the project parameter Generate as endunit
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Application (for Hysopt) parameter
Since Revit has no way of indicating what type of application you are designing, the BIM Syncer automatically adds an extra project parameter Application for piping systems to the model.
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If you want to remove these parameter in later stage, you can do so as explained here