We had a comment in a recent Revit MEP class that Detail Level for Ducts and Pipes are not the same at medium level of detail. The mechanical and piping engineers have a shared interest in coordinating hydronic supply/return and condensate piping with each other’s disciplines, and they like to print and share documents or views with other project stakeholders.
The line display behavior of Revit ducts will not match piping single line diagramming when switching a plan view detail level to medium. Note that at the medium display setting, pipes show as a single line, but ducts will not display as a single line as pipes do unless Detail Level is set to Coarse.
Unfortunately, this display level of the ducts is hard-coded in the program.
Simply setting the display level to course to get both pipes and ducts to show as a single line has some issues in displaying the wall types or fire rating lines which revert to simple two line wall display. There are other components besides walls where display settings will not graphically display with sufficient detail as desired. The best option is to open Viability Graphics, select the components needed, and use Course detail setting for the duct categories where necessary.
So it all depends how we need to see all other categories. If the view detail level needs to remain medium to show the wall types in more detail, the best workaround is to go to Visibility Graphics (VG) and select all the duct components to set the detail level from By View to coarse.
This way, only the components selected in the VG dialog will change to the detail level necessary for the display. The only problem is that the Flex Ducts stubbornly refuse to become single line display.
The best workaround is to use the Placeholder to model the simple linework of the flexduct. The only option in converting the placeholder to a duct will be a hard duct, not a flex duct.
Some Revit MEP users utilize a combination of placeholder line work for 8” and smaller branches and 3D ducts for main, high, and low-pressure ducts. I think it’s best to utilize the high level of detail in all duct work so as to ensure no clashes occur.