In the process of pipe diameter change, according to the default diameter change method of Revit, the pipe diameter change as shown in the following figure will be obtained with the center line of the pipeline as the alignment benchmark.

Then, when drawing duct or pipeline, Silk Road thinks that vertical and horizontal alignment can be selected in advance.

In addition, you can also use the Align command to select and modify drawn ducts or pipes.

Therefore, the existing air ducts and pipes can be easily adjusted.