You could set it up so that it uses a AC paper type air filter on the air intake side of the box, that will help keep crap from getting into the cooler. As long as the fan is running, no water will get to it.
I also have to say if you can get the return water coming back as a mist rather than a stream, it will become more efficient.
If I can get the materals together, I can do that as a project later and would love to set one up sometime just to see how well it works.
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