Condensate at ventilation outlet

Hello, I can't get the condensation under control. For our ventilation system, the pipes go through the utility room wall into the garage and from there through the wall to the outside. We have a double outlet side by side. Condensate always forms on the exhaust attachment, see pictures.

Half a liter accumulates very quickly, which then collects in the pipe. I only noticed it when it dripped in the garage (where the pipe meets the exterior wall).

At first, I thought it was rainwater because there was so much water in the pipe. During a test, water also ran into the pipe when I poured water over the cover from above. Therefore, I screwed a sheet metal piece over it. The sheet metal extends outward so that no driving rain can enter anymore. I have also already screwed the cover itself at an angle so that most of the water runs out at the front. Inside the cover, I placed a thin silicone cord to prevent water from running back.

Of course, I have already had the manufacturer here. They had never seen anything like it.

No condensation forms on the pipe itself; it is always dry when I check it. It is the attachment that forms the condensate.

What are your ideas? Different attachment? Do you know anything about this? The system is from Vallox.

Normally, there is a condensate drain on the exhaust pipe OR you have done it like we did and provided the pipe underground with drainage and a soakaway system. But then, logically, the slope must run away from the house.

Both work perfectly.

Normally, the exhaust pipe has a condensate drain OR, like we did, the pipe is placed underground with drainage and a soakaway system. However, the slope must logically run away from the house.

Both work perfectly.

Unfortunately, I don't know that. I've never seen it before, let alone been offered it. Otherwise, I have thought of something like that as an emergency solution. But in the garage, I can't get a proper drain.

Here are some pictures of the pipe routing. In the garage, the pipe goes down again and then through the exterior wall (to the right of the door). It then collects there. The only drainage so far is in the ventilation unit itself.

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

I don't understand the following:

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

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

Then I have to find out about it. The company that installed it is no longer accessible to us. After numerous errors and deadlines set by us, the work was ultimately remedied by another company. However, that only involved bathroom fittings. I had already called other companies about other minor issues, but due to the background, none of them want to take the risk. Their first question is always, "Who installed it?"