Originally Posted by BFdes93
According to the H100i page the fans are SP120L.
Now the SP120 page
states that the performance edition fan has a 62.74CFM while the quiet edition has 37CFM.
So I would guess it's 77 for both if they are based on quiets or 77 each if they are better than the performance editions.
Someone I was talking to found this: http://www.corsair.com/us/parts/cooling-parts/hydro-series-h80i-h100i-sp120l-2700-rpm-replacement-fan.html
It looks like they are 77CFM each, so I think I'll just go with two Corsair 140mm's up front to make up for the difference (they run at 68CFM).
Originally Posted by aln688
FYI, maybe a typo, but if you want to try and keep dust out you want negative pressure - i.e. all intake fans pulling in air to the inside of the case being filtered.
I don't think you understand what negative pressure means. Think about it this way: if there is more air being pushed out of your computer than there is being pulled in, the difference in that balance will result in negative pressure inside your case compared to outside. This means that air outside will be drawn in through any gaps it can fit through to make up for the difference in pressure, and if you don't have any filters on those gaps dust will inherently be drawn into the case.
The inverse of this scenario is also true. If your computer draws in more air than it pushes out then there will be a slight positive pressure to the air inside. That means instead of air and dust being drawn in through gaps, air will build up and then be forced out: this helps prevent dust from entering through any unfiltered entrances. The only risk to positive pressure is if the pressure is too high you can build up a lot of heat in the case and cook your components.
Here is a great article on case pressue by Silverstone: http://www.silverstonetek.com/techtalk_cont.php?tid=wh_positive&area=enEdited by SergeantFoley - 7/29/13 at 9:25am