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Suburban's design continues to puzzle me. I can't think of any good reason for the dimples, seems like it would just be an unnecessary step in the manufacture. If the panel is fairly large and made from very thin gauge metal, it can add some stiffness. Don't believe it's for aesthetics, nobody would see it after installed.
It's a physical fact that air is required for combustion, and I don't see where they've made any provisions for intake air. I think you have had the best idea all along. Good concern about rodent proofing. Maybe you can find some kind of vent with a screen at a big box or online?
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