My under the bed doors have nothing like that. Rubber gaskets, but nothing like you are describing. The one behind the refrigerator doesn’t even have a gasket. It does have louvers to let air in for combustion. The fridge in my Excella is over the wheel well.
If you look at the photos of the inside of the refrigerator cabinet at http://www.airforums.com/forums/f425...aes-44474.html
you can see the inside of the door. It is covered with plastic to keep the mosquitoes out, but you can see that there is nothing like what you are describing.
I will watch for the photos. It could be something a previous owner made. You have my curiosity peaked now.