Stacking cooling fans...?

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Yes and no. Putting two fans together does not increase the maximum airflow of the fans. So if you have a fan that pushes 50cfm in a theoretical, no resistance situation, putting two of them together will still only push 50cfm. What stacking can do though is help overcome resistance to the fan. It is common practice among water coolers to stack fans to help overcome the resistance of the radiator that the fans are blowing air through.
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Deuce65

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Yes and no. Putting two fans together does not increase the maximum airflow of the fans. So if you have a fan that pushes 50cfm in a theoretical, no resistance situation, putting two of them together will still only push 50cfm. What stacking can do though is help overcome resistance to the fan. It is common practice among water coolers to stack fans to help overcome the resistance of the radiator that the fans are blowing air through.
 
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mouse24

mouse24

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Nov 30, 2010
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Thats only relevant when talking about radiators or similarly dense material. You get marginally worse performance when you stack two fans together. (Unless I misinterpreted the OPs response.)
 
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crouse755

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Here's a question: If my case had 2 200mm fans as intakes in the front and in side the case behind the bars for mounting said fans i put 3 140mm fans would it help cooling in my case at all? For analogy (though crude): Take my two lane highway into a three lane? spread the air? or would this be resistance?

Can't really seem to find anything to support or not support if this would work.
 
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justcallmetom13

justcallmetom13

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Mar 17, 2014
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Make a thread!
 
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ewok93

ewok93

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Stacking fans will not increase performance. It will not increase the speed of air pushed through, in fact it may lower it, just because the front fan may disrupt the airflow. Also, that video is a joke, by the way. It is not possible to get lower than ambient temperatures with just air cooling, that's not how fans work, they simply move air onto and away from components. The only time a push/pull is useful is when on a radiator, when it does actually slow down between the two fans. Otherwise you're simply pushing air at the same speed.
 
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mouse24

mouse24

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I agree with ewok. Assuming the fans are perfectly synchronized (which they won't be under basically any circumstance) the best you would get is no change in either temps or CFM. Realistically you would get more turbulence and worse performance from the alternating fan blades just getting in the way of airflow.
 
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mouse24

mouse24

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The performance would be as good as the slowest moving fan in the setup. Stacking fans directly ontop of each other is never a good idea.
 
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