Wall box / wall boxes for exhaust hood

Hello,

I am still searching for THE wall box for our exhaust duct.
The house is still under construction, Kfw55.
Of course, an exhaust pipe alone is already an energy disaster, but we have already decided on this variant (recirculation is no alternative for us solely for hygienic reasons, even if it would be the Berbel for €2000).

In any case, my current favorite is the wall box from Weibel (which is actually more of a flap than a box). But I also have one product each from Berbel, Naber, and Miele in view. Due to the reviews on Amazon, however, I tend to choose Weibel, although it is also the most expensive box at €430. But what are €200 for a new build over 20 years...

Berbel BMK-L 150, 4.5 stars with 16 reviews, €320
Miele DMK 150, no reviews, €240
NaberCompAir STG, poor reviews, does not work properly at low settings
Weibel WMK-Accesspoint-VA, 5 stars with 113 reviews, €430 <-- best box

My kitchen builder mostly sells products from Naber. But I think people here usually don't pay much attention to the details and sustainability.

What I am now wondering is, with all these boxes, how can I best assess their thermal insulation (in the closed, permanent state)?
The fact is, there is a pipe that provides insulation with air connected to the interior. That is initially a fairly good heat conductor and thus a poorly insulated cross-section.
The only protection now is the wall box/the flap. But they are not particularly thick, whereas my house wall is almost half a meter thick. The manufacturers all write great things about being thermally efficient and suitable for Kfw55 and Blower-Door. But I really cannot judge these advertising claims.

I hope someone among you can give me any hints/tips/indications on this topic. I will also follow up directly with the manufacturers, maybe I will get an answer.
Thank you very much.

Hm... the air column in the pipe is, if you consider it "static," a good insulator. So if the flap is well sealed, not much heat will be lost. Energetically, I wouldn't worry about it at all.

Otherwise, we faced the same decision. I initially ordered the Miele. I returned the unit and ordered the Berbel box. The quality is poor for the price. Our exterior wall is over 50cm thick, so the Miele did not fit, which made the decision easier for me.

The Berbel box is good, has a large free cross-section. The plate on the outside seals conically, so it will be quite tight. Due to the construction, wind should not be a problem and nothing can rattle. A disadvantage is that the control takes a moment until the flap slowly opens.

I can't say anything about the Weibel, it is probably good too, but I liked the Berbel visually even better.

Weibel

Do you have it? Could you upload a photo from the outside showing how it looks? Visually, the oversized socket flap is certainly not great. How long have you had the part in use?

I can’t say anything about Weibel, it’s probably good as well, but I liked the Berbel even better visually.

Can you also show a photo?
With the Berbel, there is an air resistance caused by the opening mechanism, which could possibly obstruct a clean exhaust airflow. In my opinion, that would also be a point for Weibel. But maybe this factor is so small that it hardly has any effect.
Visually, I also think the one from Berbel is better.
How long have you had the part in use?

Hm... the air column in the pipe, if you consider it "still," is a good insulator. So if the flap is well sealed, not much heat is lost either. Energetically, I wouldn’t worry about it at all.

If it’s true that still air is a good insulator, then I fully agree with you.

Hello,

I am using the existing thread on the topic of wall boxes so that I don’t have to open a new one.

I need some expert advice on the subject. I have now ordered the Weibel wall box based on many positive reviews.

I now have to install the duct for the exhaust air channel myself. The core drilling for this will be done by the drywall installer.

My question is, how do I install the pipe, or which pipe should I use for this? Is the following suitable for this, or are there more specialized pipes for exterior walls? I am not quite clear from the product descriptions.

How far does this pipe need to protrude inside? A pipe bend will then be attached to it to lead into the extractor hood, right?

I want to install a Bosch Series 8 extractor hood. Do the Naber pipes fit universally on every extractor hood?

Thanks for the expert help!

Best regards

I have installed the Naber Comp Air. It works great and seals perfectly airtight. I attached an exhaust hood flexible duct to the Naber pipe using a clamp.

Is it the pipe in my link?

Can I just take any pipe or does it have to be made of a specific material?