I hope i got this one in the right place But would stacking intakes add to air flow cause i buy el cheapo fans for $.85 and they aint to good but good for the price....ne woo would stacking them 2gether suck in ne more air? heres wat i mean
I would think that it would increase the pressure delivered by the fans, and that could help out the flow marginally. though since there is the same number of blades, it could cause a harmonic and a whole crapload of noise.
This has been done before, its a waste of time. For starters, you will wear out the fan behind the "first" one very quickly...due to it running at a higher speed. Plus, theres hardly any real world benefit!