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Originally Posted by Salkcin
The fans are 92mm Enermax UC-9FAB - rated 1500-2500RPM and 28-47CFM. I found out that 1800-1900RPM are at the level of noise I can tolerate so calculating the airflow at 1800RPM it will be blowing 33,84CFM - a total of 67,68CFM with 2 of them. That's more than one 120mm @ 1300RPM can blow (~44CFM).
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Incorrct! As others have been pointing out you need data like the attached (for the Papst 4300N series from their website). As to where to get this data, what I do is if the data isn't readily available at the seller's or Mfgr's website, it's good by! You can't intelligently choose a fan without it. The data for rads is much harder to find and sometimes interpolation is reguired...but still, W/O data how can one choose?