I would imagine it wouldn't do too much good in that size cabinet. My guess is you would need one of those Moist-N-Aire commercial humidifiers. They cost twice the price but they are good for 50 cubic feet, instead of 300 cigars. If I'm not mistaken the cigar oasis XL is for desktop humidors.
I suppose those are outside measurements? Not sure what the inside is but still I would imagine you would need commercial grade humidifiers.
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