In my safe I have in addition to a golden rod heater, a chemical desicant cannister. It is about 4" in diameter, and about 12" long. I purchased from McMaster Carr, for about $35. The neat thing about these is that they are replenishable. Every six months I take it out and bake it in the oven for a half hour at the temperature prescribed. My safe is routinely in the 30 to 40% humidity level.
Bill
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