Mullions don't come in as a mesh object (Revit to Blender 4.0)

[Jedd (Jedd Morgan)]

Hi @Bold_Theory_Design
Please see my response to another user with a similar question:

Editing Streamed Rhino Blocks in Blender

This is a really good question, one that others have asked, and are likely to ask again, so I thought it deserves a complete response. As a bit of background. Rhino/AutoCAD blocks, Revit families, Sketchup components, Unity prefabs etc, all represent instancing of a group of many objects. Blender’s equivalent to this is Instanced Collections. These are maybe not the most common form of instancing in Blender, however, they are a pretty close analogue of Rhino Blocks and the other types of …

Hopefully it should clarify how we receive Revit Family Instances in Blender.

If you want to receive them as regular meshes, you should use the Receive Instances As: Linked Duplicates setting in the receive options.