IMHO #1 mistake with humidifiers is over saturating the foam. Unless you know your box is very dry and
needs excessive moisture to jack it up to proper RH make sure the medium will both absorb and excrete moisture. I have several coolerdors and leave the
drain plug open and also have several holes drilled
in the tops. A humi should not be air tight.. I regulate RH changes by covering and uncovering the ventilation holes especially in seasonal changes here
in Detroit.
cayman