Water does come into that compartment while driving down the road in heavy rain. Like stated previously, the compartment is sealed to the refrigerator
body so fumes, dust, bugs, cold/heat, and rain do not enter into the living area, but the floor does get wet and drains out the bottom. When I installed our NovaKool in our 13' Scamp
, I painted the floor with a roof sealant, insulated around the refrigerator
with styrofoam and reflectix, as much as there was room for, resealed the refrigerator
body to the trailer body as it had been with the 3 way refrigerator, and then used the aluminized duct tape on the inside of the vented door, from about 6" up from the bottom, and left the top vent above the belly band as it was. This cut down on the amount of water intrusion, but was more than adequate for ventilation for the 12 volt refrigerator.
Dave & Paula