Experiences with InVenter in Berlin/Brandenburg

Hello dear people!
We are currently considering installing a decentralized ventilation system (inventer) in our house and have read very different experiences on the internet, for example on the topics of "noise level of the fans" or "sound bridge through wall openings." Who in the Berlin/Brandenburg area has InVenter fans and would welcome us for a short house visit? Before we order them, we definitely want to see/hear them in operation! We will also bring cake! :)
Thanks!
Best regards, Achim

Hello Achim, there is a sample room in Bernau b. Berlin with all important decentralized ventilation systems permanently installed in the wall. There you can look at the devices and form your own opinion. The consultation is also good. They work independently of manufacturers! Regards HIGIL