With the box assembeled it was time to make the cuts in the wall.

I sealed of the construction site from the rest of the house with plastic foil. Placed the box in a window of the room I was working in, sealed off the rest of the window with more plastic foil so that there only was an opening for the extrated air and dust.

Then I switched on the fan and began cutting.

Roughly 30 minutes later my door opening was widened and when I removed the plastic foil sealing it turned out that everything has worked out as planned. No dust escaped into the rest of the house, only the actual construction site was contaminated.

The remaining dust was vacuumed away, the box is now waiting in the shed for a possible future use.