'Static pressure' refers to the force (pressure) needed to push air through resistance. Think blowing out air with an open mouth vs blowing the same amount of air through a straw. Takes a lot more effort.
Normal case fans move air through a mostly wide open computer case - easy peasy so can use nice quiet low pressure fans to move a lot of air. Miners are very densely packed with heat sinks and it take a much more powerful fan capable of producing real pressure to move the air and by their nature that means higher speed and LOUD.
Very good analogy...But I still didn't quite get it
. Does this mean that the supply side i.e. the cold aisle side should have more air blowing and the exhaust should be less powerful than the supply side?
no that has zero to do with it.
the fans need to blow the air force fully
think of a hose with water and no nozzle it may let 100 gallons of water a minute but not forceful like a pressure washing cleaning concrete.
in the case of the ant miner s-7 or s-9 as long as the push is close to the pull there really is not an issue.
even if the push it say 110% of the pull by the time the push reaches the pull the tight heatsink fins have slowed it so that the push will not overwhelm the pull.
think like this push>>>>110 >>>>>>>tight fins >>>>>>100>>> pull
the tight fins would make it equal
or
push >>>>>>110 >>>>>>>>>no fins>>>>>100>>>>> pull
this would allow the stronger fan to hurt the weaker fan.
but this simple is not an issue with the s-9
unless
push>>>>>>>250>>>>>>>tight fins>>>>>>100>>>>>pull
this could allow the push to hurt the pull if you could find a fan that would push that hard.
basically for the s-7 or s-9 use the stock fans
if sound is an issue try this series of sound proofing
https://www.youtube.com/channel/UC-K1Sokgy3-4CdV_uZF8ubw?view_as=subscriber
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