The ventilation system is just a mild breeze

....but that is really the old approach-......

May be, but it is mostly true. By comparison, see the area "Concrete company feedback" here in the forum. What are the prospective builders asking? There is, for example, not a single one who inquires about the essential basics. Hardly anyone is interested in the energy consumption they will have to expect with the construction project in the future. When I inspect practical installations and ask for the calculation documents => shrugs with the comment: " Ohh, if we had known that"

....The ventilation is a bit different, measuring air volumes during acceptance is apparently somewhat unusual.

No, it is the rule => commissioning protocol. Comparable to the hydraulic balancing in heating systems. Moreover, there must be a duct network calculation available.

.......The only question is whether and how the air volumes in the rooms can be increased or if there is a duct damage or error. The device itself will probably not deliver more than the max of 100%.

This cannot be assessed remotely and must be clarified on site. => expert report.

best regards

Thank you Euro,

the construction company has received the defect report and will take care of it. Is it correct that [n Flur und Diele] assigns and calculates values for the exhaust air, even though they have no exhaust air and are probably more "overflowing"?

... Is it correct that a hallway and corridor assign and calculate values for the exhaust air even though they have no exhaust air and are rather "overflowing"?

"Half-pregnant" does not exist, - it’s either one or the other! Overflow areas are, among other things, characterized by the absence of ducting on the part of the air guidance. They receive supply air from the supply air rooms affecting them and are ventilated via the exhaust air rooms acting upon them. Sensibly => equal pressure, i.e., the sum of the supply air corresponds to the sum of the exhaust air.

Thank you Euro for the good drawings. I just meant that the ventilation company could hardly have measured the areas of the hallway and the foyer, as these themselves have no supply or exhaust air. One mistake can already be enough to call the entire ventilation concept into question, multiple mistakes are then unforgivable...

I just meant that the ventilation company could hardly have measured the areas of the corridor and the hallway, since they themselves have no supply or exhaust air there.

Correct. If measurement values were indicated here, the suspicion is very strong that "cheating" occurred.

Best regards.