Sort coplanar faces froman archicad wall with an archicad window in it

Grasshopper
1

I am trying to use the grasshopper and archicad connection to aplly facade panelling to the outside face of an archicad wall, the wall has one archicad window in it. When I apply the deconstruct brep component, the resultant faces are 20 . I need to sort only the outside faces to aplply the panelling.How can do it?

Something similar to this example:

https://www.youtube.com/watch?v=vtYZG277iEM&pp=0gcJCdgAo7VqN5tD

2

Use merge complainer surfaces component and then bake it