Hello,
I am still searching for THE wall-mounted box for our exhaust duct.
The house is still under construction, KfW55 standard.
Of course, having an exhaust duct alone is already an energy loss, but we have already decided on this option (recirculation is not an alternative for us purely for hygienic reasons, even if it would be the Berbel model for 2000€).
Anyway, my current favorite is the wall box from Weibel (which is actually more of a flap than a box). I am also considering products from Berbel, Naber, and Miele. Based on Amazon reviews, I tend to favor the Weibel, although it is also the most expensive at 430€; but what are 200€ for a new build over a 20-year period...
Berbel BMK-L 150, 4.5 stars from 16 reviews, 320€
Miele DMK 150, no reviews, 240€
Naber CompAir STG, poor reviews, does not work well at low settings
Weibel WMK-Accesspoint-VA, 5 stars from 113 reviews, 430€ <-- best box
My kitchen installer usually supplies products from Naber. But I think most people don’t pay much attention to the details and sustainability here.
What I’m wondering now is: how can I best evaluate the thermal insulation of these boxes (in their closed, permanently sealed state)?
The fact is, there is a pipe designed as insulation that allows air connection to the interior. That is quite a good heat conductor and therefore a poorly insulated cross-section.
The only protection is the wall box or flap. But these aren’t very thick, while my exterior wall is nearly half a meter (20 inches) thick. Manufacturers all claim they are highly efficient and suitable for KfW55 and blower door testing. But I really can’t assess these advertising promises.
I hope someone here can provide some advice, tips, or pointers regarding this topic. I will also follow up directly with the manufacturers; maybe I’ll get some answers.
Thank you very much.
I am still searching for THE wall-mounted box for our exhaust duct.
The house is still under construction, KfW55 standard.
Of course, having an exhaust duct alone is already an energy loss, but we have already decided on this option (recirculation is not an alternative for us purely for hygienic reasons, even if it would be the Berbel model for 2000€).
Anyway, my current favorite is the wall box from Weibel (which is actually more of a flap than a box). I am also considering products from Berbel, Naber, and Miele. Based on Amazon reviews, I tend to favor the Weibel, although it is also the most expensive at 430€; but what are 200€ for a new build over a 20-year period...
Berbel BMK-L 150, 4.5 stars from 16 reviews, 320€
Miele DMK 150, no reviews, 240€
Naber CompAir STG, poor reviews, does not work well at low settings
Weibel WMK-Accesspoint-VA, 5 stars from 113 reviews, 430€ <-- best box
My kitchen installer usually supplies products from Naber. But I think most people don’t pay much attention to the details and sustainability here.
What I’m wondering now is: how can I best evaluate the thermal insulation of these boxes (in their closed, permanently sealed state)?
The fact is, there is a pipe designed as insulation that allows air connection to the interior. That is quite a good heat conductor and therefore a poorly insulated cross-section.
The only protection is the wall box or flap. But these aren’t very thick, while my exterior wall is nearly half a meter (20 inches) thick. Manufacturers all claim they are highly efficient and suitable for KfW55 and blower door testing. But I really can’t assess these advertising promises.
I hope someone here can provide some advice, tips, or pointers regarding this topic. I will also follow up directly with the manufacturers; maybe I’ll get some answers.
Thank you very much.
K
Knallkörper15 Apr 2017 17:26Hmm... the air column inside the duct, if considered as "stationary," acts as a good insulator. So, if the flap is well sealed, there isn’t much heat loss. From an energy efficiency perspective, I wouldn’t worry about it at all.
We faced the same decision ourselves. Initially, I ordered the Miele unit. I returned it and ordered the Berbel box instead. The quality is poor for the price. Our exterior wall is over 50cm (20 inches) thick, so the Miele didn’t fit, which made the decision easier for me.
The Berbel box is good and has a large free cross-section. The outer plate seals conically, so it should be quite airtight. Due to its design, wind won’t be an issue, and there is no chance of rattling. The downside is that the control takes a moment to slowly open the flap.
I can’t comment on the Weibel model, but it should also be good. However, I liked the look of the Berbel even more.
We faced the same decision ourselves. Initially, I ordered the Miele unit. I returned it and ordered the Berbel box instead. The quality is poor for the price. Our exterior wall is over 50cm (20 inches) thick, so the Miele didn’t fit, which made the decision easier for me.
The Berbel box is good and has a large free cross-section. The outer plate seals conically, so it should be quite airtight. Due to its design, wind won’t be an issue, and there is no chance of rattling. The downside is that the control takes a moment to slowly open the flap.
I can’t comment on the Weibel model, but it should also be good. However, I liked the look of the Berbel even more.
Barossi schrieb:
Weibel Do you have that one? Could you upload a photo from the outside so we can see how it looks? The oversized socket cover is definitely not very appealing visually. How long have you been using it?
Knallkörper schrieb:
I can’t say anything about the Weibel, it’s probably good, but I like the Berbel visually even more. Could you also show a photo?
With the Berbel, the opening mechanism creates some air resistance that might possibly interfere with a smooth exhaust airflow. In my opinion, that’s also a point in favor of the Weibel. But it might be such a minor factor that it has hardly any effect.
Visually, I think the Berbel looks better as well.
How long have you been using it?
Knallkörper schrieb:
Hmm... the air column inside the pipe, if considered “still,” actually acts as a good insulator. So if the flap seals well, not much heat will be lost. From an energy standpoint, I wouldn’t worry about it at all. If it’s true that still air is a good insulator, then I completely agree with you.
Hello,
I’m using this existing thread about wall boxes to avoid starting a new one.
I need some professional advice on this topic. Based on many positive reviews, I have ordered the Weibel wall box.
Now I have to install the duct pipe for the exhaust channel myself. The core drilling for this will be done by the drywall installer.
My question is, how do I install the pipe and which pipe should I use for this? Is the following pipe suitable, or are there more specialized pipes for exterior walls? I’m not quite sure after reading the product descriptions.
How far should this pipe extend inside? A pipe elbow will be attached to it to connect to the cooker hood.
I plan to install a Bosch Series 8 extractor hood. Do Naber pipes fit universally on any extractor hood?
Thanks for any expert advice!
Best regards
I’m using this existing thread about wall boxes to avoid starting a new one.
I need some professional advice on this topic. Based on many positive reviews, I have ordered the Weibel wall box.
Now I have to install the duct pipe for the exhaust channel myself. The core drilling for this will be done by the drywall installer.
My question is, how do I install the pipe and which pipe should I use for this? Is the following pipe suitable, or are there more specialized pipes for exterior walls? I’m not quite sure after reading the product descriptions.
How far should this pipe extend inside? A pipe elbow will be attached to it to connect to the cooker hood.
I plan to install a Bosch Series 8 extractor hood. Do Naber pipes fit universally on any extractor hood?
Thanks for any expert advice!
Best regards
N
nordanney28 Apr 2019 12:28I have installed the Naber Comp Air. It works perfectly and seals airtight. I attached a flexible duct for the exhaust hood to the Naber pipe using a clamp.
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