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 (mm) units and the other uses inches (in). Depending on which units you select during installation, one of them is copied to the default template folder and renamed StandardFactoryLayout.iam.
Clicking New Layout on the Factory tab, 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. Click the Factory folder to see the Factory Layout (in).iam and Factory layout (mm).iam template files.
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 Inventor Tools tab.