CurtisGreene

Great post. Full of info and a great help. + Rep

N2Gaming

Goes to put fingers in fans. +1 for good write up.

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Jon A. Silvers

Very nice . +1 rep

Volvo

it all depends on the power of the fans you have.
six 92mm 'quiet' fans can somehow give you close to 100cfm, presuming each fan pushes out slightly less than 20CFM. this if you want silence.

if you want 100CFM the quick and dirty way, you'll just need a couple of high performance 92mm fans.

six 92mm performance fans though, will give you as much airflow as a couple or even a trio of high performance 120mm fans.

-EDIT-
sorry, didnt notice your 90cFm not 90cm. :P
yes, six 90cfm fans will somehow add to over 100cfm total of course.
but thats depending on how you balance this airflow.
stacking all six fans together is definitely a way to get 6x90cfm, as well as having your fans burn out rather quickly.

Volvo

i'd just like to add something to this guide, with my experience with 92mm fans.
i won't comment on most other sizes since i don't come into contact with fans of other sizes as compared to 92mm ones.

judging the performance of a 92mm fan is rather simple.
most 92mm fans come standard with 7 blades and have a thickness of 25mm, so generally, this is where its standardised.

with this, i can tell you that the faster the fan spins, the more airflow you get from that single fan. measuring the speed is rather easy.
unlike 60mm fans, where 0.12A at 12V lets the fan run at 4500RPM, and 0.12A at 12V on a 80mm fan runs it at 2200rpm, fan speed is somewhat equal to the current of the motor on 92mm fans.

an example.
i have a plethora of AVC 92mm fans running in my casing. the exhaust fan has a rating of 0.3A, and speedfan reports it as running at close to 3000rpm (3000 +/- 100rpm).
the 0.4a 92mm fan in my AVC heatsink runs at close to 4000rpm. (4000+/-100rpm).
two 0.12a 92mm AVC's on my side panel that sucks in air to cool the graphics cards and hard drives spin at around 1200rpm each.

so with this, low speed, quiet 92mm fans have about 0.1 to 0.12A of current.
medium speed ones have 0.15 to 0.20A of current.
high speed performance 92mm fans will take in 0.28 - 1.0 or 2.0A of current.
exceptions like the Delta AFC0912DE that takes 2.5A of current - that spins at 6000rpm.