Stiffeners can be required by some ductwork specifications for strengthening the duct. You can access the stiffener dialogue from your Global Database listed under the Fittings section. Please use the Navigation & Toolbars for information on how to access the global database using your application.
There are multiple methods for stiffening including external flange stiffening and internal tie rod application. This topic will run through an example of use and how the breakpoints can be used to apply different stiffeners, based on the size of duct. Related Topics: Stiffener Breakpoints.