I had the same problem. That design is correct per Atwood. It's designed that way to keep exhaust fumes from entering the fresh air intake of the blower. Check the silicone around the black insert where it meets the trailer wall. Mine was not sealed well from the factory. Also, make sure the screws in the door are snug. There should be a black foam seal on the inside of the door. For added protection, I cut a small (1/4") piece of wood and placed under the board. I then applied a small bead of silicone to the front side of the board where it rested on the wood. Have not had a problem since.
Very poor design on the door. Hope this helps.
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2914 Tracer 2950BHS