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The name and the thickness of the Liner are critical to be the same as you will select the liner by the name in Takeoff and the program will upsize the outer dimensions based off the thickness. There are no limits to the number of Liners you can have setup.
For Liner Calculations visit this page
Liner Setup
Click New, Edit or Duplicate to add or modify the liner information.
Name - This is the term or name of your liner that you use
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Duct/Fitting Pounds per Square Foot – to include additional weight when a liner is applied (for double wall) enter the weight you wish used
Coil Slow % - If the coil line applies the Liner then the duct liner labor should be adjusted. Some coil lines have two settings, duct without liner is produced faster than duct with liner. The Duct SqFt/Hr will be set to 0 and the slow down rate will be input as a percentage.
Example: If applying liner to the coil line duct slows the production rate by 10%, input a 10 as the slow % (as shown above)