To Add a Hatching Pattern to Identify a Duct System
Use this procedure to add hatching patterns to duct systems so that you can easily identify separate systems on complex drawings. For example, you can specify different hatch patterns for supply and return duct systems.
In the drawing that contains the duct systems, click Manage tabStyle & Display panelStyle Manager drop-downHVAC System Definitions.
Select a duct system.
In the right pane, select the Display Properties tab.
Double-click Plan under Display Representations.
In the Display Properties dialog box, select the Layer/Color/Linetype tab.
Select Hatch under Display Component, and specify it as visible.
Click the Hatching tab, and specify a hatch pattern.