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How can we know our case air pressure?

post #1 of 16
Thread Starter 
dear all
i've just read link
so, how can we check our case air pressure?
instead of
Quote:
Simple Pressure Test

Easiest way to check for what pressure you have is to apply a square of toilet paper to an empty hole on your case (use your watercooling holes if you have them, but any decent sized hole/mesh area where air flow can get through will work) and place the TP over the hole. If the TP is being blown outward then you have positive pressure; if it is being sucked in then you have negative pressure.

thanks
post #2 of 16
You can use a lighter rolleyes.gif
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post #3 of 16
Thread Starter 
Quote:
Originally Posted by ronnin426850 View Post

You can use a lighter rolleyes.gif

so? what kind of lighter? Zippo?
and where i must put the lighter?
post #4 of 16
Quote:
Originally Posted by JustAddict View Post

so? what kind of lighter? Zippo?
and where i must put the lighter?

Any kind of lighter or candle.
Place it near an opening on the case, and see in which direction the flame goes. Don't keep too long, you may melt your case smile.gif
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Fujitsu Siemens A17-2A Logitech K280e SuperFlower SF-550K12XP Thermaltake Versa H25 
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Ex-wife's Rig
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CPUMotherboardGraphicsRAM
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Hard DriveHard DriveCoolingOS
2x Seagate 3Tb Samsung 850 EVO 120 Scythe Ninja 3 Rev.B Windows 10 Pro 
MonitorKeyboardPowerCase
Fujitsu Siemens A17-2A Logitech K280e SuperFlower SF-550K12XP Thermaltake Versa H25 
MouseAudio
Logitech G402 Sony MDR XD150 
CPUMotherboardGraphicsRAM
Athlon 750K 4.0Ghz AsRock FM2A75 Pro4+ Sapphire R9 270X Dual-X Kingston 2x4Gb 1600 
Hard DriveHard DriveOptical DriveCooling
Samsung 850 EVO 120  Western Digital 320Gb LiteON DVD-RW CoolerMaster Hyper Z600 
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post #5 of 16
Smoke bomb hehe would be cool.
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post #6 of 16
A lighter near any unfanned openings or vents in the case

toilet paper would work in theory but its usually too heavy, with a flame, youll detect even the slightest movements of air

why do you think rhino hunters in the movies use a lighter instead of toilet paper to test the direction of the wind tongue.gif
post #7 of 16
Or you can add up all the CFM of all the intakes and if its greater than the CFM of the exhaust you are usually left with positive pressure. And Vice versa for negative pressure.
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post #8 of 16
Thread Starter 
Quote:
Originally Posted by ronnin426850 View Post

Any kind of lighter or candle.
Place it near an opening on the case, and see in which direction the flame goes. Don't keep too long, you may melt your case smile.gif

Hav done it, and it blow the candle
So my air pressure is positive right?
And i can't melt my case because it the positive air blows it off biggrin.gif
Quote:
Originally Posted by tsm106 View Post

Smoke bomb hehe would be cool.

How can i use smoke bomb if i don't know how to make it?
Can you help me???
Quote:
Originally Posted by mnkeyprince View Post

A lighter near any unfanned openings or vents in the case
toilet paper would work in theory but its usually too heavy, with a flame, youll detect even the slightest movements of air
why do you think rhino hunters in the movies use a lighter instead of toilet paper to test the direction of the wind tongue.gif

Hav done it
I tried like golfer do
Wet a finger and put a finger near my case
And the result is....
Positive air... You have to tried it sometimes...
biggrin.gif
Quote:
Originally Posted by Costfree View Post

Or you can add up all the CFM of all the intakes and if its greater than the CFM of the exhaust you are usually left with positive pressure. And Vice versa for negative pressure.

Thanks
Its positive air pressure
post #9 of 16
Quote:
Originally Posted by Costfree View Post

Or you can add up all the CFM of all the intakes and if its greater than the CFM of the exhaust you are usually left with positive pressure. And Vice versa for negative pressure.

This doesn't work well as the actual fan flow into or out of a PC case can be much different than the (theoretical), advertised fan free air flow depending on numerous factors affecting flow.
Edited by AMD4ME - 3/29/12 at 10:12am
post #10 of 16
Thread Starter 
Quote:
Originally Posted by AMD4ME View Post

This doesn't work well as the actual fan flow into or out of a PC case can be much different than the (theoretical), advertised fan free air flow depending on numerous factors affecting flow.

Numerous factor?
Such as?
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