The only furnace cover that I am aware of, that's on the outside, is the chrome metal cover for the air intake and exhaust. That is removed by removing the screws. Furnace access is from inside via the air return opening. The outside removable grilles, with the turn locks, are for the refrigerator and water heater, which is found on the other side.
This is how it is on my 2004 36 FDS, yours may vary.
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Larry, Eileen, and Finley
2004 Alpine 36FDDS
Third motor home, first Alpine, no need for another.
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