You might want to try a couple of the 12v brushless DC fans, they range in
size from 30mm up to about 200mm
They move a lot of air for their size, like the ones you find in your
computer to ventilate the case
I had two network file servers running inside a closed cupboard total load
of about 1000w with a hole in the bottom
Back of the cupboard and one 100mm brushless DC fan to extract the air at
the top and didn't have an issue with them overheating
Worth a look at least, they normally run about $10 each, or free if you can
get your hands on a couple of old computers and pull them apart
To get the fans out of the power supply's
http://www.ebay.com.au/itm/2x-Brushless-DC-Cooling-Fan-12V-120mm-x-120mm-x-2
5m-/180729347608?pt=AU_Components&hash=item2a144efe18
this link just goes to one I found on ebay no doubt you could find your own
regards
craig
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