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I had the same question and found out they forgot to cut it out. Had them fix at Red Bay. You should take a pic of the rear box and ask Tiffin. My heater was enclosed in the box and no hole for the return was made. Heater would cycle as it should when it overheats or gets no flow.
Thanks Deasnealy, I need to know where the cold air return is is it under neath the bed? As we had unwanted critters I enthusiastically spray foamed openings and crevices and now I am concerned that I may have sealed the cold air return...:(. Help!
Thanks, I found it. On the side of the fuse panels in the closet there are two vents. I'm pretty sure it's for the furnace. I sealed a large hole underneath the washer and dryer and I thought that maybe it was a furnace vent. But it is not.