stacking fans?

There was another thread about this some time ago... On another thread they said it actually lowered the RPMS a bit.
 
I have stacked fans onto of each other, it dosnt boost anything. Like oscaryu1 said it more or less just lowers your Rpms :/
 
I saw actual tests on this one time, I don't remember where but I think the only way to improve air flow was to use two fans, but have them one fan length apart from each other.
 
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