Install a fresh air supply for the fireplace into the screed

Hello everyone,

in our new house (currently in the shell construction phase) we have also planned a fireplace. The chimney has a fresh air supply (Schiedel Absolut), which we would also like to use for our "desired fireplace."

Even though the fireplace will come later, we would like to lay the fresh air supply today at the later location into the floor (into the screed), as this seems to work reasonably well with flat ducts.

Now to my problem, see picture:

Path 1: would be the direct route, only one "bend," but we would then have to connect to the "short" side of the fresh air supply. I don't know how that would work...

Path 2: would be the long route, 2 "bends," but I reach the "wide" side, where I expect significantly more air to come in.

Explanation of the picture:
- red box = fireplace
- X = center, that's where the fresh air has to go
- fresh air duct = short side 10 cm, long side 23 cm (according to the internet)

Do you have any idea? What would be your solution?

Hello,

there are adapters to have supply and exhaust air connected to each other.
Search for
Schiedel Absolut LAS-Zuluft-Adapter Anschluss Längsseite/Stirnseite

Have this installed.
We have it like that too. Supply air at the bottom and exhaust air at the top.
If you know the distances, give them directly to the one who is building your chimney.

Regards

Basically exactly what I was looking for, thank you very much!.... Problem: Chimney is already built, ground floor is already finished

Anyone else have an idea?