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Objects colors in Revit

In Revit MEP we have three type to control on elements color, and the priority as following:
1. Object Style
2. Model VG
3. System type from project browser
4 Filter VG

Starting the default colors come from object style in this sample we will talk about ducts:

If you change the color from VG-Model, the color will change and will override the color from object style:

And if you change the color from the duct system, will override the VG-Model elements

And the color will override if you change it from filter-VG

So the top priority from filter-VG.

And I recommend to change the colors from filter-VG, becuase we can control the element categories to be in this filter.

But if you change it from system, and some people like this, all element in the connected system will change same image below: