I was asked today by one of my customers, "What is the easiest way to hatch duct work in Revit MEP to indicate which duct work has been installed on a project." There are several ways this could be accomplished. You could simply use the Filled Region to manually hatch the duct work. This is simple, but is tedious and time consuming.
Method 2 would be to use Phases inside of Revit MEP. You could set up some phases and change the graphics of the phases to indicate the hatching. This is easy enough, but almost an over kill.
The method I ended up recommending is to just use View Filters. You can simply create a new filter and change the graphics of the filter to have the hatch pattern.
I created a short video to share with my customer and thought it might be helpful for others.