Condensate at ventilation outlet

I don't understand the following: How can the water run back into the pipe if the exhaust air is constantly running? It actually blows the droplets outside, right? Otherwise, you could check the slope of the ceiling pipe in the garage. It looks to me as if it is exactly in the wrong direction

In my opinion, this is due to the design flaw of the following adapter. I have already screwed this adapter to the wall with compressible tape so that it stands further away at the top and the water should therefore run forward. But that only happens to a limited extent. The design of the adapter is simply not good. Our exhaust pipe is compressed by the adapter to the size of the slot. You can see in the picture that an adapter is pushed into the ventilation pipe for this purpose. The slot is located in the upper area of the ventilation pipe itself. The condensate that forms in this area runs back "down" into the pipe. The condensate forms exclusively on this inserted adapter.

As wrote, a condensate drain is normally installed. I would ask the company that installed it...

So that I understand correctly, are you really talking about a condensate drain on the ventilation pipe (just before it passes through the exterior wall)? There is a drain after all, but it is INSIDE the Vallox ventilation unit. From the unit to the outside, the pipe runs a few meters with some ups and downs.

So that I understand correctly, are you really talking about a condensate drain on the vent pipe (just before the breakthrough at the exterior wall)? There is a drain, but it is INSIDE the Vallox ventilation unit. From the unit to the outside, the pipe runs a few meters with an ups and downs.

That now depends somewhat on the device, but yes, actually the condensate drain for this purpose should be placed before the device where your pipes run.

In my opinion, this is due to the design flaw of the following attachment.

No, you are mistaken. The Vallox exhaust grilles are by far the best combined attachments the market has to offer. It is not a design flaw but has been developed and tested through painstaking work.

Are you serious or is that irony again?

Are the Vallox parts made of metal or plastic? If metal, the air flowing out could already condense on the component and not only run back in from the outside.