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I only became consciously aware of the downpipes through the comments here. Downpipes are part of the house.

So, this was fashionable among some architects in the '68 era

Were emergency overflows already mandatory back then? Because they are there to drain the water if the downpipe were clogged. If ever a trickle comes out of an emergency overflow (near every downpipe), all alarm bells must ring.

However, such purely aesthetically motivated implementations are always associated with maintenance. This applies to many extras such as electric backwater valves or passive residential ventilation. Just for your information: a friend is an installer. He has installed many residential ventilation systems but has hardly any maintenance contracts. The question now is whether a backwater valve, an internal downpipe fails or a residential ventilation system gets dirty because it is a defect in the construction or because the owner does not invest in the obligatory maintenance?

I would not use internal downpipes in a Swedish house or a classic single-family house; in a Bauhaus, it is pure aesthetics. But then you also have to bear the follow-up costs. However, with annual inspections, nothing should go wrong there, similar to many other things in life (car inspection, preventive check-up at the doctor, etc.).

Cover the roof side and dormer (south?) with photovoltaics.

Yes, it is the south side. But we have no money left for photovoltaics.

Were emergency overflows already mandatory back then? Because they are there to divert water if the downpipe is clogged. If ever a trickle comes out of an emergency overflow (near every downpipe), all alarm bells should ring.

However, such purely aesthetically motivated designs always involve maintenance. This applies to many extras such as electric backflow valves or passive residential ventilation. Just for your information: a friend of mine is an installer. He has already installed many residential ventilation systems but almost no maintenance contracts. The question now is whether a backflow valve, an internal downpipe fails, or a residential ventilation system gets dirty because it is a defect in the construction or because the owner did not invest in mandatory maintenance?

I would not use internal downpipes in a Swedish house or a classic single-family home; in a Bauhaus it is pure aesthetics. But then you also have to bear the follow-up costs. However, with annual inspections, nothing should go wrong, similar to many other things in life (car inspection, medical check-up, etc.).

That he does not sell maintenance will be because people can now maintain it themselves... what is there to maintain in such a controlled residential ventilation system?

That he doesn’t sell maintenance is probably because you can now maintain it yourself ... what is there to maintain on such a controlled residential ventilation system?

If you check, clean and disinfect the intake point, outdoor air ducts, heat exchanger, fan, filter chamber, distributor box, air ducts for exhaust and supply air as well as all valves yourself, that’s okay. Depending on the component, this is required not annually but at longer intervals. I can just as well maintain the electric backflow valve myself if I have the time and desire to go down below. But I don’t like that ))

Please explain to me exactly what the plumber services on the fan of the controlled residential ventilation or on the heat exchanger? What exactly does he do on the distribution box? We can clean the supply and exhaust air ourselves (Erlus) and the only thing the plumber would do according to his own statement would be to change the filters on the device itself and at the outlets etc... and I can do that myself...