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Stacking fans?

post #1 of 15
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The title says it all.
Is stacking fans worth it? Has someone done it?
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post #2 of 15
In general, NOPE. all it creates is a steady column of moving air, if thats what you want go for it. It doesnt add to air pressure which is the important requirement in most of the cases.
    
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post #3 of 15
You can only stack at most two fans, and they have to be rotating in different directions for any benefit to be found. That's really hard to find because the vast majority of fans produced rotate in the same direction. You need somehow find a good fan that rotates the other way.
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post #4 of 15
Quote:
Originally Posted by yoshirama View Post
You can only stack at most two fans, and they have to be rotating in different directions for any benefit to be found. That's really hard to find because the vast majority of fans produced rotate in the same direction. You need somehow find a good fan that rotates the other way.
like flipping the fan around?
post #5 of 15
Quote:
Originally Posted by yoshirama View Post
You can only stack at most two fans, and they have to be rotating in different directions for any benefit to be found. That's really hard to find because the vast majority of fans produced rotate in the same direction. You need somehow find a good fan that rotates the other way.
lolwut?

You know you can just turn the fan around right?
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post #6 of 15
Quote:
Originally Posted by Eagle1337 View Post
like flipping the fan around?
Quote:
Originally Posted by blackbalt89 View Post
lolwut?

You know you can just turn the fan around right?
I think he means that you would need a fan to spin clockwise and another one counterclockwise (while blowing air in the same direction). If you flip it around, then it will blow air down.
    
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post #7 of 15
Quote:
Originally Posted by Eagle1337 View Post
like flipping the fan around?
then it would blow like > < this lol
post #8 of 15
Quote:
Originally Posted by -Allen- View Post
I think he means that you would need a fan to spin clockwise and another one counterclockwise (while blowing air in the same direction). If you flip it around, then it will blow air down.
Wouldn't that just cause turbulence?
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post #9 of 15
Quote:
Originally Posted by blackbalt89 View Post
Wouldn't that just cause turbulence?
Nope, just more static pressure, and in some designs, less noise.
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post #10 of 15
Push/pull is the most feasible form of what you are talking about. In general it wouldn't be cost effective to buy 2 identical fans when you could buy one fan that is thicker and more powerful. Since stacking fans doesn't work without clock wise and counter-clock wise rotations you might as well just get 38mm fans and a fan controller so you can adapt them.

Push/pull on a heatsink still work pretty good, but the benefit doesn't scale well as you get more powerful and thicker fans.
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