A factory layout is an Inventor assembly file that contains additional data used by the Factory Design Utilities add-in. There are two factory layout templates; one uses metric units and the other uses inches. Depending on which units you select during installation, one of them is copied to the default template directory and renamed StandardFactoryLayout.iam.
When you click New Layout on the Factory Launch panel of the Get Started tab, it looks for and uses the StandardFactoryLayout.iam template file. If you click New on the Quick Access toolbar, the New File dialog box displays the Inventor template files. The Default tab contains the standard templates. When you click the Factory tab, the Factory Layout (in).iam and Factory layout (mm).iam template files are displayed.
If you want to create a factory layout with different units, you can access the template from the New File dialog box. If you want to change an existing file, you can specify the units using Document Settings on the Options panel of the Tools tab.