Ok, Coolerdors are 100% air tight. When I recharge my Bead tubes my coolerdor will run over 70% ( do to too much distilled wtaer in beads) Just leave the lid open for a hour or two and then close it. Check the RH the next day if it's still two high repeat step 1. Unlike desktops, I will only have to charge my beads maybe twice a year in my coolerdors. This is not a very big problem. You should be able to get it under control quickly.