By Nicholas Bowley, IMAGINiT Building Solutions
Assigning colors to elements in Navisworks based on what MEP system they are associated with can be quick, easy, automated, and standardized using the Appearance Profiler
Here is a write-up to apply colors to elements from Revit systems:
To assign colors to MEP systems from Autodesk Fabrication CADmep you can follow the same steps but use the following properties.
Equals: Supply Air (Modify as Appropriate)
The color will change regardless of the layer color used in AutoCAD.
Follow the steps in this link to standardize and reuse the color standards.