KW40 house: Manufacturer refuses steam extractor

Hello dear builders and professionals!

I thought I could install whatever I wanted in my KW40 to be built, as long as the energy requirements were met. But apparently, I am mistaken. When I asked whether the desired range hood with exhaust function in SUMMER (=hybrid control) could still be accommodated, I received the negative indication that this project is basically "not accepted."
Of course, this disappointed me, as I did not expect the manufacturer to refuse this question at all. At least as long as the KW40 certification had not yet been calculated. The refusal is not justified energetically, but technically. A range hood allegedly extracts much more ("8000m³/h") from the house than the controlled ventilation (besides which a window would have been tilted) could supply again. Regardless of the fact that the hood I favor "only" delivers 1,100m³ (others don’t deliver more either, at least none non-commercial), the argument is that the ventilation system suffers from it. A call to the hood manufacturer revealed, as expected, that the hood has a two-wire cable that temporarily switches off the controlled residential ventilation when the exhaust is used.

I have not presented this fact yet because I also had the impression that there is no real interest in a technical solution. It is apparently an effort to deal with it, and the outcome of the attempt is apparently too uncertain for the manufacturer. It is a Bavarian prefabricated house manufacturer.

Does anyone have reliable facts on this topic? Has anyone already installed a hybrid hood in a KW40 house? I am currently inquiring with the controlled residential ventilation manufacturer whether their motors can be deactivated via the mentioned cable.

Thanks for your tip!

Assigned externally. It's your house. The electrician is supposed to install it.

8000m³/h"

Do you want to run a fast-food stand in your house? :D The usual range is 500 to 1000 m³/h, which is of course still more than the ~200 m³/h of the ventilation. And theoretically, it could make the Kf(!)W-40 plaque harder to achieve, but that’s about it. Regardless of the fact that I wouldn’t install exhaust air in controlled residential ventilation, there’s nothing against it, but you can also do that yourself after handover. ;)

That's nonsense!

You can't get 1100 m3/h with closed windows anyway, a new building can't be that leaky anymore.
And let's say the 500 m3/h that your [Kontrollierte-Wohnraumlüftung] provides comes through several supply air vents, the one in the kitchen is just one of many, so you get a nice draft throughout the whole house and the entire [Kontrollierte-Wohnraumlüftung] no longer works properly.

Why do you want to build a super-tight house with [Kontrollierte-Wohnraumlüftung] only to then blow out the expensive heated air in winter at high pressure?

Why do you want to build a super-tight house with controlled ventilation only to blow out the expensively heated air in winter at high pressure again?

The answer is already in the title: VAPOR EXTRACTION

Why would you want to keep the nasty heated air in the house at any price... let's ignore the 10 days when you heat expensively.

We also switched to recirculation mode, precisely because of the [Kontrollierte-Wohnraumlüftung]. However, it would have technically been possible to combine both. It would probably have been best to use electric window openers and that kind of stuff. In the end, it wasn’t useful enough for us. We have a downdraft extractor plus [Kontrollierte-Wohnraumlüftung]. It smells for a while, then the [Kontrollierte-Wohnraumlüftung] pulls everything away.