Air exchange rate experiences, tips?

Hello friends,

I have now set up the controlled residential ventilation with WR Nibe Ftx 239 W.
In the basement, a volume of 95.3 m³ was determined in one room, with a factor of 1.5, supply air (target 16 m³/h determined value 22 m³/h). What does the factor stand for?
I am surprised, because if I calculate correctly, the air in the room is only exchanged after 6 hours (in the living room after 4.4 hours (140.6 m³ factor 3 should be 31 m³/h, is 32 m³/h). Can that be correct? Or is there something wrong with the Nibe?

Hello,

... Can that be correct?

The correct air volume flows can be taken from the air volume plan according to DIN 1946-6 (nominal ventilation). These values are also taken into account in the heating load calculation. When balancing the system, the specified values must be adhered to; otherwise, problems may arise in very well-insulated buildings (KFW 55 and better).
It is important during balancing that calibrated attachment hoods are used.

Best regards