Don't forget about air filters!
I use furnace filter material for my PC's.
Huge filter so it can get a bit dirty and still have good airflow.
Clean is cooler

Air filters - great suggestion! Nice to see someone offering positive ideas. I never even thought about filtering the air intake.
Did a search, but I can only find small, pre-cut sizes on the ebay etc.
I did find this, which looks like it would be big enough to cover the entire front of the KNC miner:
http://ramair-filters.co.uk/automotive-accessories/air-filter-foam-material-universal-fitment.htmlIs this material the same as a furnace filter?