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When the rear case fan creates an area of low pressure in front of it, you're hoping that this will link up nicely with the air being pulled though the CPU cooler, but if there's an unhindered flow of air via those PCI vents, the rear fan will waste come capacity recirculating air from the outside rather than actually exhausting the heated air from the inside.
Emyr
@ 
shortucts?
That sounds like a lot of work for something that is probably sensible (so thanks for the advice), but I think I'll leave it for now. It's working and I'm happy.