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The return air issue has been talked about for years. The consensus is that there is more than enough return air pulled from other places and the grills are not really needed.
We do not use the propane heat at all anyways. If we camp in cold weather we will only go if we have electric hook ups so we can run a ceramic heater or 2. The only time it may run is upon the first arrival somewhere in cold weather just to warn it up quick and then the heaters take over.
Besides I could easily create the returns by simply drilling holes in the risers and very back of the stair case and insert round grills for the return air.
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