Static Pressure on a fan

[Manny Calavera]

http://www.overclock3d.net/news.php...h_38mm_thickness_and_higher_static_pressure/1



What is this and what does it mean ??

I plan to use a few of the 2k 38's (3) on my new rebuild and want to know.They put out a lot more CFM then the 1k ones' but WAY more static pressure,how is that a good thing?

 

[alg7_munif]

Well I think that it refers to the velocity of the air moved by the fan. Since velocity change creates force and force on an area creates pressure, I guess that a fan with a high static pressure will blow air at a higher speed. The advantage is when you block the fan with a heatsink with tight fins, the fan could stil move a lot of air through the fins compared to a lower pressure fan.

Flow rate on the other hand refers to the volume of air moved by the fan in a period of time. For an example if an 120mm fan could have an equal flow rate as a 250mm fan, the 120mm fan would have to move the air with a higher velocity. I think that a fan with a higher static pressure would have a higher noise level. Btw 45.9dB is A LOT of noise.