Dave, Excuse me "stupid" word, english it's not my native language and sometimes I can't find good words to describe things. The comparison you gave also miss the point, because its base value is RPM not CFM. RPM gives unclear idea about silence and airflow. Voltage is not linear with airflow, from ...

One thing I think you should consider - all comparisons should be made at the same airflow level, NOT same voltage level. . The idea of comparing fans at 5,7,12v level is very stupid, as it doesn't show true performance to silence ratio. For ex. if you compare two fans, and results are: fan 1: 7v , ...