ᐅ Distance between exhaust air outlet and fresh air intake only 2 meters
Created on: 26 Jul 2021 16:15
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chrisreal89C
chrisreal8926 Jul 2021 16:15Question for the professionals:
-New build KfW55 standard
-Central ventilation system
The specialist company has only maintained a 2-meter (6.6 feet) distance between the exhaust air and the fresh air intakes, arranged vertically in a line (see pictures). Fresh air on top, exhaust air below.
This setup is on the west side. Now, I and several other contractors are concerned that there might be air short-circuiting occurring. The specialist company has no concerns at all and sees no alternative option (due to dew points, etc.).
Unfortunately, this issue was not properly considered during the shell construction planning by the plumbing company.
Maybe someone has an alternative solution or idea? Or perhaps no concern at all because they have installed a similar system like this multiple times?
The idea of underground routing was rejected due to condensation risks (according to the specialist company). The idea to locate it on the other side of the exterior door was also dismissed (which would also only be about 2 meters (6.6 feet) apart).
Our equipment room is very limited in space, and the west side is the only exterior wall. Do you need any further information?
Looking forward to your opinion, advice, or solution!
-New build KfW55 standard
-Central ventilation system
The specialist company has only maintained a 2-meter (6.6 feet) distance between the exhaust air and the fresh air intakes, arranged vertically in a line (see pictures). Fresh air on top, exhaust air below.
This setup is on the west side. Now, I and several other contractors are concerned that there might be air short-circuiting occurring. The specialist company has no concerns at all and sees no alternative option (due to dew points, etc.).
Unfortunately, this issue was not properly considered during the shell construction planning by the plumbing company.
Maybe someone has an alternative solution or idea? Or perhaps no concern at all because they have installed a similar system like this multiple times?
The idea of underground routing was rejected due to condensation risks (according to the specialist company). The idea to locate it on the other side of the exterior door was also dismissed (which would also only be about 2 meters (6.6 feet) apart).
Our equipment room is very limited in space, and the west side is the only exterior wall. Do you need any further information?
Looking forward to your opinion, advice, or solution!
C
chrisreal8926 Jul 2021 17:08Hi, it is a Viessmann Vitovent 300-W, and the following is noted:
5
Outdoor air supply and exhaust air opening
The intake opening for outdoor air and the outlet opening for exhaust air should be positioned as far apart as possible to avoid short-circuiting of the air flows (minimum distance 3 m (10 feet)). The wind direction must be taken into account to prevent influence from wind pressure.
5
Outdoor air supply and exhaust air opening
The intake opening for outdoor air and the outlet opening for exhaust air should be positioned as far apart as possible to avoid short-circuiting of the air flows (minimum distance 3 m (10 feet)). The wind direction must be taken into account to prevent influence from wind pressure.
If it remains open like that, I believe it is actually unfavorable for air circulation.
We had a similar issue with the general contractor back then, also due to limited space in the utility room. In the end, it was installed similarly to your setup, but our general contractor worked with the plumber to have a custom part made (which was apparently quite expensive, over 1000 euros just for the part without installation) that allowed them to create a duct through our carport roof upwards.
The fresh air now comes in from above the carport, while the exhaust air is below, just like in your case. So far, we haven't had any problems with this solution.
I’ve attached some before and after photos.
We had a similar issue with the general contractor back then, also due to limited space in the utility room. In the end, it was installed similarly to your setup, but our general contractor worked with the plumber to have a custom part made (which was apparently quite expensive, over 1000 euros just for the part without installation) that allowed them to create a duct through our carport roof upwards.
The fresh air now comes in from above the carport, while the exhaust air is below, just like in your case. So far, we haven't had any problems with this solution.
I’ve attached some before and after photos.
O
Oetzberger26 Jul 2021 18:13Precisely because it is located in a slightly sheltered corner, air short-circuiting is quite likely.
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