The quickest and easist method is to right click on a piece of ductwork and select edit object display. From there click on the bolded display representation and it will open up the display property dialog. Here you can turn off the lining, edit the color, the layer, or the linetype. To edit the layer, the layer must already exist in the drawing. Editing it in this manner will also change the lining display for duct fittings and flex duct. If you need it to change colors in more than one display representation, you will need to make the change in EACH display representation.
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