To be able to link information in dRofus with IFC objects exported from Revit, there has to be a common key between the two. For Rooms / Spaces, this key will have to be the "Room Function Number", and for Items, the "Item Number".
If the above is carried out prior to exporting the IFC file from Revit, once the file is then uploaded to dRofus, you will be able to compare and check the model against dRofus using IFC objects. It is also important to be aware of the logic attribute “To be modeled” for Items within dRofus. Items that do not have the "To be modeled" attribute checked will not be part of the IFC validation within dRofus.
You can use the Revit Plug-In to Export IFC Model from Revit. Before you export you can manipulate how Revit exports the IFC file by going to: File > Export > Options > IFC Options:
Before you start adjusting the IFC export settings, it is highly recommended that you use the “Save as” option first to make a backup of your current export settings.
By setting values as “Not Exported” within the "IFC Class Name" column against elements of various Revt Categories, you will exclude these as IFC object types in the export:
The above can be done to reduce the size of the IFC file if you (for e.g.) only want to use the IFC to compare Rooms / Spaces in dRofus. You can also use this settings dialog to define how elements of different Revit Categories are exported. For example, if elements of the Revit Category “Specialty Equipment” is by default exported to fall under the IFC Class Name "IfcBuildingElementProxy (proxy element)", you will not be able to make a comparison of these elements within the Item overview in dRofus because Revit proxy elements do not have a corresponding type object in IFC. If however, you change this to fall (for e.g.) under the IFC Class Name "IfcFurniture" instead, the IFC export will include type information for all Revit elements that were of the Revit Category "Specialty Equipment".