BlowerDoor Test Problems?

I have no problem with the roller shutter (inspection from the outside). I used concrete cable, without a conduit, which goes directly into the roller shutter box.

My window installer insisted on a conduit.

Our house has a second level on the exterior walls, the so-called installation level, in which all the cables are laid and, for example, sockets are installed. There are no drafts. We have a KFW 55 house, but with the blower door ... n 0.53

My window installer insisted on an empty conduit.

They just like to keep it simple [emoji16]

What can you do if no airtight boxes were used in the exterior walls and everything is already plastered? Tearing it out is not an option.

what can you do if airtight boxes were not used in the exterior walls and everything is already plastered?
Tearing out is not an option.

Nothing.
Tough luck.