static pressure.. high or low?

[rezaul1996]

so i was looking around for a good static pressure fan for a radiator when i watercool my pc. im confused about the measurements and whether a high value is good or a low value.

 

[Darkbreeze]

For exhaust fans, high static pressure isn't necessary, since there's relatively little resistance. For intake fans or fans on heatsinks and radiators, high static pressure is desirable. For radiators and heatsinks, depending on the demands of the system, I generally recommend these for 140mm PWM fans:

http://www.noctua.at/main.php?show=productview&products_id=65&lng=en&set=1

Or these for 120mm:

http://www.noctua.at/main.php?show=productview&products_id=42&lng=en&set=1


If you're not looking for expensive fans, the Cooler Master Sickleflow 120's are ok and have decent static pressure, but they don't use great bearings and generally don't have a long quiet lifespan.

 

[popatim]

Higher is better

 

[rezaul1996]

Higher is better

so higher value CFM is better for static pressure fans, thanks

 

[rezaul1996]

For exhaust fans, high static pressure isn't necessary, since there's relatively little resistance. For intake fans or fans on heatsinks and radiators, high static pressure is desirable. For radiators and heatsinks, depending on the demands of the system, I generally recommend these for 140mm PWM fans:

http://www.noctua.at/main.php?show=productview&products_id=65&lng=en&set=1

Or these for 120mm:

http://www.noctua.at/main.php?show=productview&products_id=42&lng=en&set=1


If you're not looking for expensive fans, the Cooler Master Sickleflow 120's are ok and have decent static pressure, but they don't use great bearings and generally don't have a long quiet lifespan.

i understand which fans to use for exhaust and radiators, i just don't understand how i can compare two air flow fans or two static pressure fans to determine which one is better

 

[Darkbreeze]

CFM and static pressure are two distinctly different things. A fan can have a very high cubic feet per minute when there is little resistance, and completely suck when there is a lot of resistance. That's why high CFM fans are good for exhaust and high static pressure fans are good for intake and radiators/heatsinks. Fans with high static pressure quite often DO NOT have high CFM ratings, but will maintain MORE CFM's through a radiator or as intake because the fan with the higher CFM that has a low static pressure, struggles to move any air once there is significant resistance.

What fans do you want to compare? Generally the tested specs for each fan, including CFMs, Static Pressure and Sound pressure levels, are listed on the manufacturers website.