ᐅ Decentralized ventilation system with 24V?

Hello,

I am building a KfW 70 house in May and have chosen decentralized ventilation systems for the bathrooms. Since my bathrooms are quite small, the bathtub has to be placed on the outer wall side. The problem is: due to the installation zone of 2.25 meters (7.4 feet) for a bathtub, I can no longer install a ventilation system there! However, it would be possible with 24 V.

I have already searched online but unfortunately found nothing. Has anyone here ever found a 24 V ventilation system?

Do you have only one exterior wall in your bathroom?

Yes, I only have one exterior wall in the bathroom. Since there is a 1.13-meter-wide (3.7 feet) window in that exterior wall and the bathroom is only 7.65 square meters (82.3 square feet) in total, including a bathtub, shower, sink, and toilet, there is simply no space left.

What about installing it above and then routing the piping down into the bathroom ceiling?

It is definitely cheaper than any special models with 24V.

Above the bathroom, there would be an attic. However, I thought there are no decentralized ventilation systems where ductwork is possible? According to the heating engineers, they always require two direct core drillings to the outside?

There is a suitable solution for every problem