Air pressure?

[xnoobftw]

Isn't it better to have static pressure optimized fan for intake and airflow optimized fan for exhaust if you want positive air pressure while maintaining a well ventilated environment for your PC?

Or does it not work that way?

[Senzelian]

Isn't it better to have static pressure optimized fan for intake and airflow optimized fan for exhaust if you want positive air pressure while maintaining a well ventilated environment for your PC?

Or does it not work that way?

Nope, because pressure optimized fans can only maintain pressure in a closed enviroment. (Pressed against a radiator)

But your case has most likely a lot of holes like the PCI-e slots. So you can not build any pressure up.

So it is way more effective to get as much air as possible through the case by heaving lots of intakes and outtakes that move a lot of air.

[OAcesync]

Static pressure is only for providing airflow in confined spaces like radiators

[Dustmop]

It depends. If you have air filters, which you hopefully would, and drive cages or something else in front of the intakes then that is a good situation to use pressure fans. If there really isnt any obstruction to the intakes then I dont see why it would be better to use airflow.

[MeltingPoint]

Nope, because pressure optimized fans can only maintain pressure in a closed enviroment. (Pressed against a radiator)

 

 

 

Static pressure is only for providing airflow in confined spaces like radiators

 

 

I can't get my head wrapped around this idea. Why wouldn't these fans be able to move air if there is no resistance in front of them? It doesn't make sense. They are just better suited for the job of moving air through restrictions. It doesn't mean that they won't work with little to no restriction.

 

Static pressure optimized fans are perfectly fine for use as ventilation fans as they also move air. It is a common misconception that static fans are only for heatsinks/radiators and airflow fans are only for ventilation. The latter is quite true but static fans also make great case fans.

[xnoobftw]

Nope, because pressure optimized fans can only maintain pressure in a closed enviroment. (Pressed against a radiator)

But your case has most likely a lot of holes like the PCI-e slots. So you can not build any pressure up.

So it is way more effective to get as much air as possible through the case by heaving lots of intakes and outtakes that move a lot of air.

 

Static pressure is only for providing airflow in confined spaces like radiators

 

It depends. If you have air filters, which you hopefully would, and drive cages or something else in front of the intakes then that is a good situation to use pressure fans. If there really isnt any obstruction to the intakes then I dont see why it would be better to use airflow.

 

 

I didnt know about static pressure vs airflow before i bought my fans (2 sp 120 high performance edtion and 1 sp 120 quiet edition)

I would like to ask if my fan setup is alright

 

Red being the sp 120s (high performance editions are up on top)

Brown being my 290x

Blue being stock fans that came with my spec 03

Purple being my CM 212x (Which is blowing towards the rear)

[OAcesync]

I can't get my head wrapped around this idea. Why wouldn't these fans be able to move air if there is no resistance in front of them? It doesn't make sense. They are just better suited for the job of moving air through restrictions. It doesn't mean that they won't work with little to no restriction.

 

Static pressure optimized fans are perfectly fine for use as ventilation fans as they also move air. It is a common misconception that static fans are only for heatsinks/radiators and airflow fans are only for ventilation. The latter is quite true but static fans also make great case fans.

It's designed for confined spaces and can provide airflow in non confined spaces but normal fans can provide more airflow in a unconfined space

[Senzelian]

I can't get my head wrapped around this idea. Why wouldn't these fans be able to move air if there is no resistance in front of them? It doesn't make sense. They are just better suited for the job of moving air through restrictions. It doesn't mean that they won't work with little to no restriction.

 

Static pressure optimized fans are perfectly fine for use as ventilation fans as they also move air. It is a common misconception that static fans are only for heatsinks/radiators and airflow fans are only for ventilation. The latter is quite true but static fans also make great case fans.

Static pressure fans simply move less air than airflow fans, because of their much wider less angled blades. Also they have less blades and a airflow optimized fan.

And for heatsinks I would actually use an airflow fan. Pressure optimized fans are only for radiators!

And of course make static pressure fans also great case fans, but there is a difference between 50 m³/h and 100m³/h

 

-snip-

No, you fan setup is actually pretty bad.

But even a correct fan setup doesn't make a lot of difference in temperatures.

A general tip here. Move those SP fans as an outtake and use the AF fans as an intake.

That way you get at least more air into the case. Workes fine for me.

Oh yeah and the top should be exhaust only, because warm air raises up!

[MeltingPoint]

It's designed for confined spaces and can provide airflow in non confined spaces but normal fans can provide more airflow in a unconfined space

Both types of fans go inside a case most of the time (it is a confined space) so your argument is invalid.

 

 

Static pressure fans simply move less air than airflow fans, because of their much wider less angled blades. Also they have less blades and a airflow optimized fan.

And for heatsinks I would actually use an airflow fan. Pressure optimized fans are only for radiators!

And of course make static pressure fans also great case fans, but there is a difference between 50 m³/h and 100m³/h 

 

But then again you won't be running them at full speed most likely. Also, intakes and exhaust grilles are restrictions, as well as heatsink fins, drive cages and whatnot.. That is why I always go for static optimized fans.

[W-L]

-SNIP-

 

Personally I use all static pressure fans in my entire case since it has fine meshed fan filters on everything, it helps to push or draw the air through them better. Usually though airflow fans are used on non restrictive areas to move air.

[xnoobftw]

Personally I use all static pressure fans in my entire case since it has fine meshed fan filters on everything, it helps to push or draw the air through them better. Usually though airflow fans are used on non restrictive areas to move air.

 

 

Both types of fans go inside a case most of the time (it is a confined space) so your argument is invalid.

 

 

 

But then again you won't be running them at full speed most likely. Also, intakes and exhaust grilles are restrictions, as well as heatsink fins, drive cages and whatnot.. That is why I always go for static optimized fans.

 

 

Static pressure fans simply move less air than airflow fans, because of their much wider less angled blades. Also they have less blades and a airflow optimized fan.

And for heatsinks I would actually use an airflow fan. Pressure optimized fans are only for radiators!

And of course make static pressure fans also great case fans, but there is a difference between 50 m³/h and 100m³/h

 

No, you fan setup is actually pretty bad.

But even a correct fan setup doesn't make a lot of difference in temperatures.

A general tip here. Move those SP fans as an outtake and use the AF fans as an intake.

That way you get at least more air into the case. Workes fine for me.

Oh yeah and the top should be exhaust only, because warm air raises up!

 

 

It's designed for confined spaces and can provide airflow in non confined spaces but normal fans can provide more airflow in a unconfined space

 

How is my fan setup above then?

[W-L]

How is my fan setup above then?

 

Is the top going to be a rad or something, I'd setup the top and rear as all exhaust and the front and bottom as intake with a higher RPM than the exhasut to provide positive static pressure to keep out dust.

[Senzelian]

But then again you won't be running them at full speed most likely. Also, intakes and exhaust grilles are restrictions, as well as heatsink fins, drive cages and whatnot.. That is why I always go for static optimized fans.

You should first ask yourself how much pressure is actually need to get the maximum amount of airflow through a fan-grill or radiator.

A airflow optimized fan will also provide air pressure. Just enough to get through any fan grill and to use the rest of it's energy to provide as much air as possible.

A pressure optimized fan does exactly the same. But it simply focuses on more pressure and therefor less airflow, because for radiators you need a certain amount of pressure to even get that little bit of air flow you get from a pressure optimized fan.

 

How is my fan setup above then?

I told you that already...  :rolleyes:

[xnoobftw]

You should first ask yourself how much pressure is actually need to get the maximum amount of airflow through a fan-grill or radiator.

A airflow optimized fan will also provide air pressure. Just enough to get through any fan grill and to use the rest of it's energy to provide as much air as possible.

A pressure optimized fan does exactly the same. But it simply focuses on more pressure and therefor less airflow, because for radiators you need a certain amount of pressure to even get that little bit of air flow you get from a pressure optimized fan.

 

I told you that already...  :rolleyes:

whoops!

I have that config because i wanna maintain positive air presure and since i have my 212x blowing to the rear the top front sp120 is supplying fresh air to my CPU cooler

The hot air from both gpu and cpu will then travel towards the rear of my case!