You might look into Bentley's Integrated Structural Modeling (ISM) to move a Revit model into the world of Bentley structural products. For HVAC, I don't know of a method. You might have to import into an I-model or dgn via IFC and then trace over it. That's what we have to do with Revit plumbing models when they been used to create process piping and we need to generate isometrics (spool fabrication sheets) using Isogen, etc. Unfortunately that's a cost the client has to bear due to lack of Integration between BIM and ISO 15926 platforms.
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