Roof distances for supply and exhaust air controlled residential ventilation

Good day
It appears that the supply and exhaust air ducts have been installed too close to each other. Next to the supply air ducts, there is a box housing the ventilation unit for the [Attika Wohnung] (the ventilation units for the other apartments are installed within the condominiums). The exhaust air from the unit on the roof is directed exactly east, the same direction as our supply air ducts. The supply air from the roof unit is directed south. Are there any regulations regarding this? The apartment building is Minergie-certified. The exhaust air from the unit on the roof is about 1 meter away from our supply air ducts on the roof. Doesn’t this cause contaminated air to be sucked in? It also draws in the smell of the wood stove heating from our neighbors, who live 25 meters away.
If the arrangement of the ducts and the ventilation unit on the roof is incorrect, how can rectification be claimed from the general contractor? The building is 1.5 years old.
Thank you very much for your help.

Hello Sugus,

To avoid a short circuit over the roof, a distance of at least 2m between the outdoor air intake and the exhaust air outlet must be ensured.
Regarding orientation to the cardinal directions, the only requirement is that the outdoor air intake must not be placed on the weather side of the house.

As for the wood stove odor, the operation of the wood stove should be checked; the neighbor is probably not burning sufficiently dry wood.
For this matter, it is best to ask the responsible chimney sweep for help.

Thank you HB-F Moderator, what does this mean: For orientation according to the cardinal directions, the only requirement is not to position the outside air intake on the weather side of the house. What exactly does that mean.
Kind regards and best wishes Sugus

Hello sugus,
that means the weather side is the side of the house with the most/frequent strongest wind movements. If the outdoor air intake is aligned accordingly, the volume flow of the outdoor air intake can increase too much, and the air delivery pressure would then be unfavorably high for the proper functioning of the ventilation system - unless a volume flow controller has been installed.

Thank you for the response HB-F. Is there then a way to deal with incorrectly installed supply and exhaust air ducts that were not mounted 2m apart? The general contractor does not listen. Thank you very much

Hello again, if a general contractor refuses to acknowledge a possible defect, a lawyer would be a good advisor – or initially a certified construction expert/building surveyor – although it is uncertain whether the general contractor would trust this construction expert, so perhaps better to go straight to a lawyer.