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How to maintain Duct bottom elevation in revit 2019 version .input file3d viewsecton view
Have a look at the justification tool.
As you create your Duct set the Vertical Justification to Bottom
never-displayed
![2021-10-25 11_16_58-Autodesk Revit 2019.2.3 - [Project1 - Section_ Section 1].png](https://forums.autodesk.com/t5/image/serverpage/image-id/981431iE761DC1253E1AC2B/image-size/large?v=v2&px=999 "2021-10-25 11_16_58-Autodesk Revit 2019.2.3 - [Project1 - Section_ Section 1].png")