XServe cooling options

I have an XServe G5 sitting in a half-height cabinet with doors front and back. There are a couple of other tower servers sitting on the floor, but plenty of empty space inside. My XServe, though, is getting excessively toasty - the fans are always very loud, and the system light comes on at least once a day saying that CPU1 has exceeded its temperature threshold (if only for half a second or so).
At the moment it's hopping between 5-30% CPU use (doesn't usually go much above that, except at backup time). CPU temps are 76/65C; CPU1 blower is at 14,000 RPM and CPU2 is at 5,000RPM.
What I'm wondering is, how can I get the thing to cool down? CPU1 always seems much toastier than CPU2. I'm interested in any way of getting the server a to cool down a little - I'm planning to put more rack servers in the cabinet, which will only make it warmer. There's a space on the roof to fit a fan, but that'll just blow down onto the top of the XServe which isn't all that helpful. The door on the cabinet is unfortunately glass, so no air will be going in when it's closed, but I keep it and the rear door ajar.
I'm pretty new at this lark and don't really know much about cabinet standards (I got mine from BlackBox UK). What are the usual ways of cooling the kit down cheaply (bearing in mind it's only 3-5 servers, not a whole rack full)? Is it better to have air blowing up, down or sideways? Are there any good (preferably UK) suppliers of cooling equipment? Any cooling/airflow hints and tips would be greatly appreciated...
Dual XServe G5, MacBook Pro   Mac OS X (10.4)  

Doors are unfortunately not vented, **** things. I can probably find a way of removing them but then a) there's physical access to the server and b) it's **** noisy. Replacement doors would be nice, but again, I don't really know where to look for them, and whether they're standard sizes. I'm considering sticking a few fans on the roof of the box sucking air from the bottom and blowing it out the top - is this a sensible sort of idea? The cost of buying a new cabinet will probably be a bit much - I'm trying to coll the insides down in the cheapest posssible way.

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