Which light wells in case of potential backlogged seepage water?

Oops, with a decentralized controlled residential ventilation system it naturally becomes more difficult...

There are also pressure-resistant shafts made of plastic, but you’re looking at 700-900 € there. 1150 € sounds better, still a lot of money, but you won’t get it much cheaper.

Best regards,

Andreas

Hello,
may I mention names and companies here?
If not, please contact me. I have a contact person there. Maybe he can help you. Consultation and etc. were all done by phone. Very competent contact person.
Best regards