Positive air pressure question

andreaszero · Jun 17, 2015

Hi, I have a Fractal Design Define R5 Black w/ Window and I want to know if my current fan setup creates positive air pressure. My fan setup is:

2x Noctua NF-A14 PWM @ front of the case for intake

1x Noctua NF-A14 PWM on a Corsair H90 on push setup(exhaust) @ back of the case for exhaust

I read that to create positive air pressure, more air should get in the case than out and that's what I did. So is this positive air pressure?

(The removable panels on top of the Define R5 are all there, I didn't remove them)

ubercake · Jun 17, 2015

Your idea of positive air pressure is correct. Since all the fans are the same model, as long as the front fans combine to intake more air than the rear fan (fan speed will determine this), you have positive pressure.

andreaszero · Jun 17, 2015

ubercake :

The fans are PWM which means they control themselves. They ramp up when they think its needed

smackers_12 · Jun 17, 2015

andreaszero :

Not neccessarily, it depends how they are set up.

andreaszero · Jun 17, 2015

smackers_12 :

andreaszero :

Not neccessarily, it depends how they are set up.

What do you mean how they are set up? They are all connected to 4-pin fan headers on my Asus z97-A.

ubercake · Jun 17, 2015

smackers_12 :

There are two intakes in the front and one exhaust blowing push over the rear rad. How much more info do you need?

As long as the two front intakes combine to bring in more air the the rear fan exhausts, for most situations you're going to have a positive pressure situation. There are a few exceptions, but most would involve more exhaust fans.

Also, OPer should look up linus tech tips push vs pull vs push/pull. You'll find using pull rather than push with the rad might be a better option.

andreaszero · Jun 17, 2015

all i needed, thanks

smackers_12 · Jun 17, 2015

ubercake :

smackers_12 :

There are two intakes in the front and one exhaust blowing push over the rear rad. How much more info do you need?

As long as the two front intakes combine to bring in more air the the rear fan exhausts, for most situations you're going to have a positive pressure situation. There are a few exceptions, but most would involve more exhaust fans.

Also, OPer should look up linus tech tips push vs pull vs push/pull. You'll find using pull rather than push with the rad might be a better option.

No; I'm aware that the fans will give positive pressure. I'm saying that just because the fans are on PWM headers (not even sure if the z97-a headers are true pwm) does not mean they will automatically be speed controlled.

ubercake · Jun 17, 2015

smackers_12 :

ubercake :

No; I'm aware that the fans will give positive pressure. I'm saying that just because the fans are on PWM headers (not even sure if the z97-a headers are true pwm) does not mean they will automatically be speed controlled.

Newer motherboards will run fans with speed or voltage controls for the most part. But the possible variation is why I mentioned the fan speed bit.

smackers_12 · Jun 18, 2015

Yea, thats fine, I know that my board does not change the rpm much at all by itself. Was just pointing out that it does not necessarily speed control itself. In regards to the question there is positive airflow going in and most likely positive pressure.

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