This information isn't in the 3D model file, but in the PluginFurnitureCatalog.properties file of a SH3F file.
Please read the two following threads to get information about the parameters that will help you to achieve this:
http://www.sweethome3d.com/support/foru ... ,2006#8919
http://www.sweethome3d.com/support/foru ... ,1489#5937
Don't hesitate to ask more questions if you don't succeed to use one of these properties.