In Revit MEP 2012 the use of systems for duct and pipe gives color to those entities. Nice for us. Getting that visual indication makes a huge difference in being able to differentiate supply, return, exhaust, and cold, cold water recirc, and vent. I found out the other day, architects aren't so keen on it. They have been getting around previous methods of us color coding things, but the use of systems might catch a few off guard. When at a loss on how to handle the colorful MEP model one of our clients called on Joe Eichenseer at IMAGINiT for help.
Joe slam dunked it will a filter for the architect.
Then changing the color and line weight when applied.
Another satisfied customer. Thanks Joe!