Preparation for central controlled residential ventilation system

Ask me again in a few months
Planning and commissioning must be done by a specialist company or the manufacturer.
Laying pipes hopefully can already be done in EL. I have someone who has done that before, but also have great respect for it.

How is it actually with the warranty for pipe network installation in EL?

Won't the HLB then refuse responsibility in case of problems with the system and say that it is your issue, since you did the piping? Don't you see that as critical? I mean, you never get access to the sewer network again once it is installed in the ceiling.

Sorry, abbreviation is still familiar to me. HLB = heating, ventilation installer? Well, you never get access to the pipes again, that's true. But you can still do so much wrong with the pipe at first. There are push-fit connections between pipe and wall/ceiling outlet. Still, I don't want to encourage anyone to do it themselves before I have done it myself. Sure, if something goes wrong somewhere, it's your own fault. At least no water leaks out, like in plumbing. And the house doesn't burn down like with electrical work.