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Is it an LG? I pop one of the windows out, count to five, and put it back in when the humidity needs to be lowered quickly. As long as you don't go below 65% I don't think you'll need to worry about shrink-wrapping. When I did it, my humidity lowered by 12% fast, and then came back up by 6% in a few minutes and stayed there.
Added: (this is only to be done if humidity is far too high and the chicks are panting)
I keep my bator on the sink counter in the master bath; it's out of the normal stomping grounds of my small children and already in position if I have to open it during hatching.