I have heard that a fan can help distribute the humidity evenly and reduce mold. Though for most people I doubt that a fan would be a great help. If you have a large enclosed area then maybe it might help uniformily distribute the humidity (though it probably wouldn't be significant in a small humidor). You should be able to get enough flow of air just by opening up the humidor every once in a while if your not already to get your cigars. I don't think a fan would hurt though.
And instead of getting a sprinkler system why don't you just get the cigars insured for fire damage?
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