Controlled residential ventilation supply air in the living area near the sofa

Personally, I would prefer to place the supply air in the "left corner," but I assume that with a good=correct design of the system, no draft should be noticeable. At least not in the currently shown position. It was once stated to me that with a well-designed system, no draft is felt!

... I have no feelings except hunger and thirst.

Reproduction? ...... ...... ...... ......

Why only one supply air valve in the large room? Wouldn't two valves in the southern corners be better?

Certainly a justified question. With 43 sqm - 2.5m ceiling height, this results in a room volume of about 107.5 cbm. With an air exchange rate of 0.3-0.4/h, the supply air would have to deliver 32.25 - 43 cbm/h. This is usually not achievable with one pipe, so it must be connected twice. The risk of flow noise and drafts thereby increases.

The positioning is also not so perfect to ventilate the room. I would also move the exhaust air from the stove (this is not a second range hood :)).

Maybe better to have a supply air on the left in the corner and one on the right in the other corner of the room. Connect the exhaust air twice and regulate it to 3/4, the remaining airflow goes through the hallway to the upper floor.

Edit: Is the plan complete or is there a missing building part from the ground floor?

No, the plan was not complete, a small office, pantry, and guest toilet were still missing, attached now is the entire ground floor. Yes, the supply air in the living area is supposed to be supplied via two pipes. I don’t remember how it was with the exhaust air in the kitchen. I have marked the idea with the supply air in the corners, did I understand it correctly? And exhaust air kitchen further away from the stove? That actually makes sense, because if the stove sucks downwards and the controlled residential ventilation sucks upwards... that really strains the cook (or rather the cook) :)

Fine positioning please coordinate with lamp outlets and smoke detectors, possibly presence detectors. And coordinate with access points. So that nothing collides and nothing hangs all over the ceiling in a mess.