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Great tip on holding of on the alignment. One possibility to reduce or eliminate dust when using a fan is to take a page out of diesel locomotives...they filter the air that's used to cool the engine compartment. This does two things, not only is the air that's brought into the compressor filtered, it also pressurizes the loco so that ambient dust etc can't migrate in.
Needn't be anything too complicated, even a cheese cloth may suffice. One thing to watch out for would be if the fan failed for any reason the available convection cooling may not be enough.
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