this is what I did for my YY cube, just took a round duct for a 92mm fan and installed it in the front panel and I put a 92mm fan on the top of the case for an exaust fan, was more than enough airflow back when that system was air cooled and that system is a dual processor machine, now that it's water cooled it's only about 70F inside the MB compartment.
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Athlon 64 3000+ Venice / Asus A8N-SLI Premium / 2X Corsair XMS 512mb PC3200
BFG 7800GTX / Audigy 2 / Dell FP2001 20.1" / Antec TruePower 2.0 TPII-550
WD Raptor 36.7GB / WD Raptor 74GB / Maxtor 120GB SATA
Water Cooled: CPU Swiftech Storm / GPU Maze 4 / Danger Den Double Heater core / Eheim 1250
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