Cfm vs Rpm fans

[rd_herdman1]

Im having trouble deciding which fan to purchase im looking at two different fans ive seen another thread talking about CFM vs RPM and how both fans can be different yet move the same air. Basically one fan is 240 cfm and 3000 rpm and the other is 442cfm and 2380rpm. I basically i cant figure out which fan pushes the most air. Thanks for any help.

 

[Gam3r01]

CFM is the number you want. The second fan moves more air, plain and simple.
The RPM is a completely different measure. Thats how fast it has to spin to get the listed CFM value. Generally, but not always, lower RPM is quieter.

 

[rd_herdman1]

Thank you