ᐅ Decentralized ventilation system with minimal visibility on the exterior facade

Hello dear building forum,

We are constructing a 210 sqm (2,260 sq ft) single-family house to KfW 55 standard and want a decentralized ventilation system. (We have deliberately decided against a central ventilation system, but this is not the topic here.)

I am looking for a system that is discreet on the exterior of the house, for example, integrated into the window reveals. We do not want to have fans visible on the facade in every room.

Who has experience and can recommend something? I look forward to the exchange. Best regards

Even though it’s not the main topic, you would then use a central ventilation system rather than a temporary solution designed for existing buildings.
There will always be a hole in the wall; otherwise, how would it work?

Lumpi_LE schrieb:

Even if it’s not the main topic, you typically choose a central ventilation system rather than a makeshift solution for existing buildings.
There’s always a hole involved in this case; how else could it work?

Thank you for your feedback. I know that installing a central ventilation system is cost-effective and energy-efficient. However, we have decided against it and are now looking for a decentralized solution for our new build.

I have read that it is possible to integrate the fans into the window reveals or use internal transfer grilles.
I would simply appreciate experiences and tips from other homeowners who have also chosen a discreet decentralized ventilation system.

I don’t find ventilation openings in every reveal that inconspicuous. From a distance, yes, but when you’re closer, you can definitely see them.
In my opinion, the least noticeable solution would be an active exhaust system installed only in a few specific rooms, venting for example through the roof. Air supply would then come through window rebate openings and overflow vents.

Tolentino schrieb:

I don't find ventilation openings in every window recess that discreet. From a distance, yes, but when you get closer, you can still see them, right?
In my opinion, the least noticeable would be a purely active ventilation system in a few specific rooms, venting for example through the roof. Fresh air would then enter through window rebate openings and via overflow ventilation.

Yes, that sounds good. But who do you contact for such customized solutions?
I am also not entirely happy with the window recesses. Therefore, I am looking for more ideas.

Window rebate opening -> window manufacturer
Decentralized ventilation -> HVAC (heating/plumbing/ventilation) or building services engineer. There are also companies specialized solely in ventilation, but I’m not sure if they handle single-family houses.
When building with a general contractor / main contractor, always consult them.