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artemis0007 · 06-22-2002, 01:35 PM

Unfortunately, I can't duct the exhaust out of the side of the case because my NMB PSU is longer than regular PSUs (it's for my Thunder K7). I also can't move my hdds because I need the railing on the mobo side to support my raid card (that bugger's BIG).

I am uncertain about some cfm math.
My fans:
80mm = 36.9 cfm
92mm = 56.8 cfm
120mm = 126 cfm

From the pic above, my rad is sandwiched between two 120mm fans. But I connected them to a rheobus so I can control them. Okay, so if I reduce the voltage to the 120mm fans by half, the cfm output for each is roughly half, right? But since that fans are serial, does that mean that the cfms add up again to produce 126 cfm?

I was wondering because I am close to a net 0 cfm for that side of the case. I have 93.7 cfms going out, and (if math is right) about 126 cfm going in. So I can just tweak the knobs from there to find the sweet spot.

Thanks for the suggestions! Keep them coming!

06-22-2002, 01:35 PM	#20
artemis0007 Cooling Savant Join Date: Sep 2001 Location: Davis, CA USA Posts: 113	Unfortunately, I can't duct the exhaust out of the side of the case because my NMB PSU is longer than regular PSUs (it's for my Thunder K7). I also can't move my hdds because I need the railing on the mobo side to support my raid card (that bugger's BIG). I am uncertain about some cfm math. My fans: 80mm = 36.9 cfm 92mm = 56.8 cfm 120mm = 126 cfm From the pic above, my rad is sandwiched between two 120mm fans. But I connected them to a rheobus so I can control them. Okay, so if I reduce the voltage to the 120mm fans by half, the cfm output for each is roughly half, right? But since that fans are serial, does that mean that the cfms add up again to produce 126 cfm? I was wondering because I am close to a net 0 cfm for that side of the case. I have 93.7 cfms going out, and (if math is right) about 126 cfm going in. So I can just tweak the knobs from there to find the sweet spot. Thanks for the suggestions! Keep them coming!