Use Fill Voids to remove any internal spaces of the geometry. It is important to remove internal spaces of the geometry to increase performance in Revit .
Begin panel
Recognize Revit Features
BIM Ready Content panel, select Recognize Revit Features If you choose to preserve the Inventor features already recognized by Revit, these features will be saved and hidden as you continue to recognize Revit features from the remaining base solid geometry.
If you choose to convert Inventor features already recognized by Revit back to base solids you will no longer have any features that are recognized by Revit. Choose this option if you need to start over. For example, if you have created Inventor features and are having difficulty getting them translated to Revit (for example, Check Revit Features reports errors), you can create a base solid and recognize new Revit features.
Simplify panel, select Fill Voids.
Simplify panel. When you create a simplified part, the part will be opened in the newly created part (.ipt) file.
to apply and continue.
to finish. Click here to view the step by step workflow for creating a friendly RFA model.