Originally posted by 74Argosy24MH
Is there anywhere in the top of the tank(s) where a duct had run?
My rectangular black water tank is molded with a roughly three inch radius, semi circle cutout near one corner where the heated air enters. The opposite corner of the same side is missing (by design) to give a somewhat "dog-eared" appearance. The floor was still solid in that area, so I know an exit hole was not there. My model does not have a gray water tank, and I did not identify any other ducting.
The air probably exits around the drain valve. Once the new decking, and metal support box for the black tank are installed, I will do a sanity check to make sure the air can exit somewhere. I am still amazed at how much of the floor had turned to mulch - It made feature identification tough-to-impossible.