WRL or (decentralized) WRL - yes or no? Advantages and disadvantages?

No, but if nothing has happened after 10 years, what is supposed to happen in 30 years?

Also, there is still the already mentioned cleaning

By the way, it is rude to answer a question with a counter-question. But we paid 6500 euros including [Förderung] and installed it ourselves. It is about 1100 cubic meters of enclosed space.

Investment: 7,600 euros (including core drilling) for 12 devices including installation, tests, etc. Power consumption 1.4 - 3.3W per device, therefore <50 euros p.a......

Why didn’t his wife want any pipes? You don’t see them once they’re installed anyway...

There are long-term experiences... you just have to do your homework and then you find a lot. Ventilation systems are not as new as one might think; every bunker in WWII also had one...

To be fair, there are mixed experiences with the pipes; due to hygienic concerns.

Where fairly? There are concerns, but no experiences...

Hmm Sebastian is right there, there is a lot of fear and concern and for many it stops right there... then the cost factor comes in and suddenly ventilation systems are called witchcraft and just germ spreaders etc. pp.

I once posted pictures of the inside of my system after several years of continuous operation... there wasn't really much dust on it....