I currently have x3 replacement corsair h100i 120mm pwm fans as front intake running at 2250 to 2360 rpm and I have x2 corsair sp120 120mm fans as top exhaust running at 1700 to 1775 rpm and I have x1 corsair af140 140mm fan as a rear exhaust running at 700 to 760 rpm . so I have x3 120mm intake fans . and x2 120mm and x1 140mm exhaust fans . I am trying to have positive air flow . do I have my x3 120mm intake fans running at a high enough rpm to compensate for the x2 120mm and x1 140mm fans I have exhausting air out of my case ? do I have positive air flow or negative air flow ?
does my computer case have positive air flow or negative air flow ?
- Thread starter orndorf
- Start date
Solution
ihog
Distinguished
- May 22, 2012
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(sum of the CFM of all intake fans - resistance) + (sum of the CFM of all exhaust fans - resistance) = air flow
Are any of these fan attached to a radiator? If you've got intake fans on your radiator, you've probably got negative air flow. If you've got exhaust fans on your radiator, you've probably got positive air flow. If you don't have a radiator, then you've probably got positive airflow.
Are any of these fan attached to a radiator? If you've got intake fans on your radiator, you've probably got negative air flow. If you've got exhaust fans on your radiator, you've probably got positive air flow. If you don't have a radiator, then you've probably got positive airflow.
. so what do you think do I got negative positive or even air flow ? and do you think it would be a good idea to turn the x2 top 120mm fans into intake fans that way I will have x3 front intake fans x2 top intake fans and x1 rear exhaust fan ?
TheMagicalWallaby
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- Oct 9, 2013
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I am betting you have a slightly negative pressure. you have 3x120mm intakes that have resistance, 2x120mm exhausts with resistance, and a140mm exhaust in the rear with no existence. More air being exhausting than taking in due the the fan size in the back and the lack of resistance for it
TheMagicalWallaby
Dignified
- Oct 9, 2013
- 2,696
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An easy way to test this is by placing your hand at a vent of the case. If you feel air coming out of the vents of your case, you have positive pressure. If not, then you most likely have negative pressure.
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