Possibility to open windows with controlled residential ventilation - planning ideas

Node wins better.

I like it better. Open it seems oppressive and it needs privacy screening. It does not hang on the plants

Maybe just the middle section, as @haydee suggests

Within a room, I would not mix materials, so if aluminium, then the elements next to it should also be aluminium – but aluminium from X and aluminium from Y can be mixed (sometimes better that way, because a very good tilt-and-turn door can at the same time be a mediocre folding door). The different manufacturers should then only coat their products with powder from the same powder supplier (note: RAL is not Pantone).

Yes, you have to be careful with the color. The fixed side windows in our room are made of plastic. The shade matches, the surface is a bit matte. Even someone visually rather picky like me doesn't notice.

Looks great, Hampshire.
We also flirted with folding sliding doors, but in the end, there were just too many divisions for us, so we went with lift-and-slide doors. However, they are easy to operate and we have never had any problems opening them (the very large one is installed crookedly, but that will be fixed, then it will open more easily too).
What I notice about Hampshire: don’t you have any mosquitoes? Mosquito protection was an issue for us and we failed with folding doors. Having the whole front open would have pleased me, but with mosquito protection only a side roller blind would have been an option, and that again requires space at this size, and if you do it the way you do, with the folded windows outward, the mosquito protection would have to be installed inside. I wouldn’t find that so great. But without it wouldn’t work here.

Long story short: don’t forget mosquito protection in window planning if it’s necessary (as with us). If you can do without it, of course that’s fantastic, but I hardly know any residential areas where that’s the case. So: include it in the planning.

Pagoni: I would find it too closed off for you as it is planned now! If they are supposed to be regular doors, maybe with the middle window unit you could have two narrow fixed elements on the outside and large French doors in the middle to open? Our terrace door in the kitchen is about 120cm wide and that works well. That would mean about 35-40cm fixed glazing on the sides here each and the middle entirely for opening.

We have fixed glazing in some places. But of course only where it can be cleaned properly without scaffolding or other hassles. I would do it the same way every time. However, always with venetian blinds (or none at all), because I would also worry about cleaning the blinds from the inside. In the living room there is a lifting-sliding door a little over 5 meters wide. The part directly in front of the dining table is fixed glazed. But since the area right next to it can be slid open, I think it's okay there. For you it would be too "much" for me at the dining table as well. I find the folding doors at awesome, but the protruding part on the terrace would have bothered me.