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A still air with a fan is not a still air. It would be a regular circulating air incubator. So, I would say 99.5. I hope I understood your question right. To adjust humidity, just add water. My LG has held steady between 67-70% humidity for the last 3 days. I also have a sponge in there, it's not wet, just in there. I guess it works. I wanted it in there in case I needed to quickley boost humidity. I would pour water on it, but so far I haven't needed to.