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Testing pressure

xnoobftw
By xnoobftw
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Is there a way to test whether your PC have positive neutral or negative pressure? (that doesnt take long) I was thinking of like the tissue technique 

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Math.

 

An example with my favourite fan:

Enermax TwisterPressure x2 intake = 159.92CFM

Enermax TwisterPressure x1 exhaust = 79.96CFM

 

Voila! Positive pressure.

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Is there a way to test whether your PC have positive neutral or negative pressure? (that doesnt take long) I was thinking of like the tissue technique 

If your pc has a vent that is not being occupied by a fan:

  • Hold a little string or small/thin piece of paper up to it. 
  • If you smoke or have a insense that produce smoke, hold that up to the vent.

If it sucks it in you have negative pressure, if it blows it away you have positive pressure, or if it doesn't do anything your pressure is neutral(or really close).

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Math.

 

An example with my favourite fan:

Enermax TwisterPressure x2 intake = 159.92CFM

Enermax TwisterPressure x1 exhaust = 79.96CFM

 

Voila! Positive pressure.

Except only deaf people run their fans at 100% all the time...

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Math.

An example with my favourite fan:

Enermax TwisterPressure x2 intake = 159.92CFM

Enermax TwisterPressure x1 exhaust = 79.96CFM

Voila! Positive pressure.

Oh come on. You would have to count in filters and HDD cages for that to be accurate. And the speed of them.

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Math.

 

An example with my favourite fan:

Enermax TwisterPressure x2 intake = 159.92CFM

Enermax TwisterPressure x1 exhaust = 79.96CFM

 

Voila! Positive pressure.

 

Yeah, those numbers that are given are in completely open environments. Things like fan grills, dust filters, hard drive cages, clearance in front of and behind the fan, and other obstructions will change that. Not to mention that most people nowadays have their fans on some kind of speed curve since so many MoBos have it built into the UEFI-BIOS now. 

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Oh come on. You would have to count in filters and HDD cages for that to be accurate. And the speed of them.

 

Yeah, those numbers that are given are in completely open environments. Things like fan grills, dust filters, hard drive cages, clearance in front of and behind the fan, and other obstructions will change that. Not to mention that most people nowadays have their fans on some kind of speed curve since so many MoBos have it built into the UEFI-BIOS now. 

I probably should have mentioned that it was only a basic way that makes many assumptions. My bad.

 

Except only deaf people run their fans at 100% all the time...

I'm only partially deaf...

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Math.

 

An example with my favourite fan:

Enermax TwisterPressure x2 intake = 159.92CFM

Enermax TwisterPressure x1 exhaust = 79.96CFM

 

Voila! Positive pressure.

Tried that and it says i have positive pressure!

 

If your pc has a vent that is not being occupied by a fan:

  • Hold a little string or small/thin piece of paper up to it. 
  • If you smoke or have a insense that produce smoke, hold that up to the vent.

If it sucks it in you have negative pressure, if it blows it away you have positive pressure, or if it doesn't do anything your pressure is neutral(or really close).

Did that and it sucks in D: (when under load at least) but it blows away during idle!

The BBQ: i7-4770 / 212x / Tri-X R9 290x 1075/1400 / MSI H87-G43 GAMING / EVGA G2 850W / Corsair Spec 03 / Samsung 840 EVO 250gb SSD / Toshiba 2TB HDD / 8gb Kingston DDR3 1600mhz

Peripherals: G710+ / G502 / Bose Companion 2 Series III / Audio Technica ATH-M40x / Sound Magic E50

Monitors: Dell U2414H 

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Tried that and it says i have positive pressure!

 

Did that and it sucks in D: (when under load at least) but it blows away during idle!

 

That means that the fans on your CPU or GPU (most likely) are probably starting to create negative pressure in the case as they ramp up to higher speeds.

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That means that the fans on your CPU or GPU (most likely) are probably starting to create negative pressure in the case as they ramp up to higher speeds.

ah.... it explains!

The BBQ: i7-4770 / 212x / Tri-X R9 290x 1075/1400 / MSI H87-G43 GAMING / EVGA G2 850W / Corsair Spec 03 / Samsung 840 EVO 250gb SSD / Toshiba 2TB HDD / 8gb Kingston DDR3 1600mhz

Peripherals: G710+ / G502 / Bose Companion 2 Series III / Audio Technica ATH-M40x / Sound Magic E50

Monitors: Dell U2414H 

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Tried that and it says i have positive pressure!

Did that and it sucks in D: (when under load at least) but it blows away during idle!

Just leave it, it's good to have a general idea of weather you have neg or pos pressure, but it's not gonna affect your temps enough to even care about.

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Yeah, those numbers that are given are in completely open environments. Things like fan grills, dust filters, hard drive cages, clearance in front of and behind the fan, and other obstructions will change that. Not to mention that most people nowadays have their fans on some kind of speed curve since so many MoBos have it built into the UEFI-BIOS now. 

 

Those thing don't matter that much for positive vs negative unless difference is something like 1-3 CFM to begin with. For example using dust filters, difference is really minimal which in calculations will make it 0. Once air is inside case, things like HDD cages and cabling don't matter either. They affect on how air moves around though. As for fan curves, you can add them into calculations. CFM rated is when fan is at max rpm. So math is simple. Divide CFM with rpm and you get CFM per rpm. Now you only need to multiply CFM with rpm fans will be running to get real difference. However its easier when all your fans are same model and connected/controlled same way. Then the amount of fans is easiest way to do calculations.

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