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Which is better for exhaust: High airflow or static pressure?

post #1 of 18
Thread Starter 
So you have a very tiny case; crammed in there are alot of parts, there is no filter, just the fan to the case, is it better for a high static pressure fan or a high air flow fan. I would guess high airflow, since the air is only pulling in air. however I am not entirely sure.
post #2 of 18
high air flow. static pressure is better when the fan is pushing against something like a grill, filter, rad, etc.
 
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post #3 of 18
The answer is both. You need both, and actual flow in a given circumstance is measured by P-Q, not by someone slapping "SP" or "AF" in the fan's name.

Give a little more info about your scenario and build, and some people should be able to get you some suggestions based on fact.....you will just need to weed through the "oh you need SP fans because (enter completely unrelated circumstance here)".

This has become the topic with the greatest amount of misinformation in forums these days.
post #4 of 18
Quote:
Originally Posted by SaintsEnd View Post

So you have a very tiny case; crammed in there are alot of parts, there is no filter, just the fan to the case, is it better for a high static pressure fan or a high air flow fan. I would guess high airflow, since the air is only pulling in air. however I am not entirely sure.

ideally, if you only have 1 fan in the case, you want it to be a filtered intake fan. as ciarlatano has already mentioned, it would help alot if you can describe the build alittle more so we can help you to achieve your goal. generally speaking, PSU has an exhaust fan on it so if you use the only fan mount you have for intake you will still have the PSU as exhaust fan. if you have a video card in the build, the GPU fan is also generally regarded as an exhaust port as well. so if you have a chassis fan mount, it would be best to put a high static pressure fan on it so you can use it as a filtered intake. unless we know more about what you are trying to build, it's really the only educated guess we can help you with.
post #5 of 18
something like this fan...... http://www.sidewindercomputers.com/de12pfexhisp.html nah not really just somthing that can pullout a decent amount of air out of the case
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post #6 of 18
Thread Starter 
Ill make it really simple. There are two intake, two exhaust. It can be positive, negative or neutral pressure.

There is a straight path from the two intake to the two exhaust however there is an object in the way preventing this straight airflow (be it wires, graphics card, motherboard, you can use your imagination)

There also is a dust filter behind the intake fans making it more difficult to bring in air so you can assume they are high static pressure.

The only thing that will touch or get directly in the way of the exhaust fan are some fan grills or something to help prevent contact with the fan blades.


Will there be any benefit of using a high static pressure fan to exhaust vs a high airflow fan?
post #7 of 18
something tells me the object in question is not a computer.

given that assumption, i would say try to balance the intake CFM with your exhaust CFM. meaning if you are using some HIGH pressure fans(3000+RPM fans) on the intake side, you want to take a percentage off their rated CFM to account for the filter resistance as well as the internal component obstruction. another way of adjusting to this is to have 2 intake and 1 exhaust so the actual airflow is balanced. just make sure the exhaust fan is mounted near the hot component so the hot air is forced out of the enclosure as quickly as possible after the cooling air has done its job.

without more specifics as to the object you are working with and the sizes of the fans we are talking about, this is the most amount of help i can provide. if we have more information as to what we are working with, then we may be able to offer better assistance and maybe even change the configuration of the cooling (4 intake and let passive leakage be the exhaust if the enclosure has sufficient leakage points at the right locations.
post #8 of 18
Given the lack of specific details, I can only assume that the OP is actually building a tiny chamber meant to enslave little children.

Next thing we're gonna get asked is how he should run the feeding...I meant water cooling....tubes.
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post #9 of 18
Quote:
Originally Posted by SaintsEnd View Post

So you have a very tiny case; crammed in there are alot of parts, there is no filter, just the fan to the case, is it better for a high static pressure fan or a high air flow fan. I would guess high airflow, since the air is only pulling in air. however I am not entirely sure.

Quote:
Originally Posted by SaintsEnd View Post

Ill make it really simple. There are two intake, two exhaust. It can be positive, negative or neutral pressure.

There is a straight path from the two intake to the two exhaust however there is an object in the way preventing this straight airflow (be it wires, graphics card, motherboard, you can use your imagination)

There also is a dust filter behind the intake fans making it more difficult to bring in air so you can assume they are high static pressure.

The only thing that will touch or get directly in the way of the exhaust fan are some fan grills or something to help prevent contact with the fan blades.

Will there be any benefit of using a high static pressure fan to exhaust vs a high airflow fan?

Quote:
Originally Posted by Jidonsu View Post

Given the lack of specific details, I can only assume that the OP is actually building a tiny chamber meant to enslave little children.

Next thing we're gonna get asked is how he should run the feeding...I meant water cooling....tubes.
I agree with Jidonsu thumb.gif

OP is not giving us the info needed to configure system.

@SaintsEnd, we cannot give you specific answers to your extremely general and broad questions. Airflow is not a simple thing. Everything involved in system effects the path and rate the air flows. Even knowing all the assumed variables does not mean we can accurately predict what will work. It's like trying to predict the weather.
post #10 of 18
Quote:
Originally Posted by doyll View Post



I agree with Jidonsu thumb.gif

OP is not giving us the info needed to configure system.

@SaintsEnd, we cannot give you specific answers to your extremely general and broad questions. Airflow is not a simple thing. Everything involved in system effects the path and rate the air flows. Even knowing all the assumed variables does not mean we can accurately predict what will work. It's like trying to predict the weather.

In addition to the fact that "static pressure" and "airflow" labels really don't mean anything in actual usage.....and that suction capabilities and static pressure are once again being confused.....
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