My idea is a minimum two fan case. One fan will be modified to blow out, pulling air through the case, but not introducing sea air into the case. The second fan will have some sort of housing holding two peltier cooler based dehumidifiers, roughly $50 a pop or a tad less. The air coming off the dehumidifiers will be pulled into the case and then exit via the draw of the second fan.
I don't know if liquid coolant systems chill things down enough to make condensation a problem in a humid area. I am pretty sure a standard fan system found on most PC (CPU/GPU/etc) won't have a condensation problem since they are still well above ambient temperature, but I don't have the science background to prove this.
So the custom part is the apparatus, maybe a coffee can or similar, maybe just dryer hose, whatever will work. to take the dehumidified air and pull it into the PC case without allowing it to mix with sea or room air. Then the simple reversing of the second fan and voila! You have a somewhat humidity resistant system that should help remove both water and salt if you are near the beach.
Anyone see major problems or a better solution?
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Should do some research into it, it would be cool! :P