Do pull fans need a high static pressure?
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Soulage
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- Apr 14, 2015
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I think if you are just running the one fan then it's still better to have static pressure as you want as much air being pushed or pulled through the fins rather than from the sides etc. With two fans though I remember watching a video some time ago where they did a bunch of different configs and found static pressure as push and air flow as pull worked the best but only to a small margin when compared to both static pressure.
Soulage
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Yeh? "I think if you are just running the one fan then it's still better to have static pressure as you want as much air being pushed or pulled through the fins rather than from the sides etc."
Static pressure fan; more directionalized air flow, higher concentration in one area to overcome resistance.
Air flow fan; still good flow but more random, not concentrated, just getting as much air in / anywhere as possible.
Anything between the fan is going to add resistance, so you want a more concentrated flow to minimize the loss in push or pull.
Static pressure fan; more directionalized air flow, higher concentration in one area to overcome resistance.
Air flow fan; still good flow but more random, not concentrated, just getting as much air in / anywhere as possible.
Anything between the fan is going to add resistance, so you want a more concentrated flow to minimize the loss in push or pull.
- Oct 30, 2004
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High static pressure fans have just about 0 applicability in today's cooling systems. back in the day, radiators were built with fpi's (fins per inch) of 30 and high SP was needed to push the air thru those tight spaces. Now most rads are 8 - 12 fpi.
For example.... look at the 24 fans tested here and you will see that the best performers are Standard Pressure (SP) Fans
http://www.silentpcreview.com/article1345-page7.html
Look again here and you see that not only are both fans SP fans, but that the Phanteks fan at only 1200 rpm outperforms the 1500 rpm Noctua AF-15 by 3C
http://www.overclockersclub.com/reviews/phenteks_f140/3.htm
As for push / pull, over at martinsliquidlab, extensive testing was done on this subject and it was found that:
Fans perform better in push up to about 1500* rpm
Fans perform better in pull over 1800* rpm
* rounded to typical fan motor speeds
In between it's about the same.
The increase in performance with push / pull can range from 10 to 30%
High SP / Hi rpm fans are generally not supplied with air coolers because of the noise issue.
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