Adding Insulation and Lining to Duct

To add insulation and lining to a duct in Revit MEP 2012 do the following: 1.  Select the duct. 2.  Go to the duct insulation panel and select "Add Insulation" and or "Add Lining". 3.  When the "Add Duct Insulation" menu pops up, select the Insulation...