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I’m curious to hear the proposed solution. I have two independent designs from Zehnder, and I’d say... they’re quite straightforward. But with some discussion, it could be resolved.

A single slot in the exterior wall is definitely not enough. You might fit a flat duct in there, but you need one per room. Alternatively, two 160mm (6.3 inches) ducts could run up to the upper floor, where they connect to a manifold (to where?!), and from there branch out into the rooms. There are also manifolds that can be cast into concrete, but that needs to be properly coordinated with the structural engineer... and on the upper floor this results in floor outlets and the expensive flat duct system under the screed.
I appreciate my flat concrete roof because the cheaper round duct with ceiling diffusers can be easily installed in or on the concrete.
Or do you perhaps have suspended ceilings on the upper floor?

We do not have a mechanical ventilation system, so please excuse the possibly silly question – but why can't you go upstairs along the staircase?

Maria16 schrieb:
We do not have a mechanical ventilation system, so sorry if this is a silly question – but why can’t you go up along the staircase?

The staircase will be a wood/steel construction. So nothing to hide anything behind. Or maybe I just lack the imagination.

Zaba12 schrieb:
Zehnder has been contacted. Looking forward to their response.

This is probably better suited for its own thread now.

I hardly see any photos of houses and their fittings anymore.

Alex85 schrieb:
I’m curious to see the proposed solution. I have two independent plans from Zehnder, and honestly... they are quite basic. But the issue was resolved through discussions.

A single channel in the exterior wall is definitely not enough. You might fit a flat duct, but you need one per room. Alternatively, two 160mm (6 inch) pipes go up to the upper floor and connect to a manifold there (but where exactly?!) and from there into the rooms. There are also manifolds that can be cast into concrete, but that needs to be coordinated and approved structurally... and on the upper floor that results in floor outlets and the costly flat duct system beneath the screed.
I appreciate my flat concrete roof, where you can easily use the more affordable round ducts with ceiling vents inside or on top of the concrete.
Or do you perhaps have suspended ceilings on the upper floor?

Hi Alex, like in your case, round ducts will be cast into the concrete ceiling. Here, the architect made a major mistake. The ceilings with reinforcement in the basement and upper floor are not 22cm (9 inches) thick like on the ground floor. Fortunately, the structural builder noticed this on Monday. Otherwise, the ventilation ducts would not have fit.

All ceilings have been cast. This means the roof structure is not part of the thermal envelope.

By the way, each hole in the ceilings will cost me an additional 40€ net each. The costs for wall channels for fresh air are unknown, but they are supposed to be positioned below the windows.

@ypg: I just noticed this too. Can someone move this?

I’ll quickly join in before the thread gets moved: The staircase has two walls on the left and right sides, right? Or is it being constructed differently than shown in the plan?

In our case, all the electrical wiring runs up through one of the staircase walls, as this wall is one of the few that runs continuously from the basement to the attic. The structural engineer had no issues with this because there are several other load-bearing walls nearby.