On behalf of the user:
HVAC schematic diagrams in Revit
This is about the ability to create HVAC schematic diagrams in Revit.
The minimum requirement is to create families of connectors and other HVAC elements (for ventilation ducts) so that it is possible to scale them according to the annotation scale for detail level set for "coarse".
In such a situation, by displaying them as coarse, a simplified HVAC schematic diagram can be obtained.