RH was down to 30% in the dungeon, so I figured I better do something. This contraption got it up to 45% in a jiffy. It's hooked up to an inkbird controller to shut it off above 50%.
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The foam packing floats it an inch below the water surface for maximum output, to avoid the need for a float valve to maintain a certain water level:
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If I was using a tent I'd put a lid on the bucket with a couple of 2" holes, a muffin blower blowing in one hole, and a hose out the other hole to the tent.