If this is a new to you unit , the previous owner may have put them in to stop stuff from dropping in. They would not be factory as RV furnaces do not function well with any restriction in the discharge or return air, it is possible to overheat the furnace combustion chamber if not enough air flow moves through the system.
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99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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