I sent a request to EBM Papst (asking for the original W2S107-AA15-16 115V~ or low noise replacement).
They offered me a 4606Z (180 m³/h free airflow), that is supposed as the successor.
As they couldn't provide me the datasheet of the old fan, I'm not sure if that suggestion is based on comparison of the datasheets of the old and the "new" fan - maybe they just choose the strongest one...
Unfortunatelly the construction looks nearly identical as the original EBM, no visable signs of aerodynamic improvements (especial wingtips etc.), so I do not really expect lower noise level (45dB).
They also sent a datasheet with airflow diagram, so hopefully I (we) could find an equivalent fan from another maker, that is "low noise"...
Note: Data of the 115V types applies @60Hz, but mains frequency in Germany is only 50Hz.
I'm not quite sure how to recalculate airflow exactly, but I roughly calculate 50/60 of airflow @60Hz, so I'll expect about 150 m³/h free airflow.
Any suggestions regarding manufacturers of
low noise AC fans?