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All RV air conditioners with ceiling plenums have a provision for removing the return-air grille and the filter for cleaning. Check the owner’s manual for specific procedures. Here, the grille in a Coleman-Mach unit is gently pried off.
Some RV furnaces have an exterior vent but are built into the RV and need to be removed for service.
From left to right, the furnace circuit board, fan cage, circuit-breaker reset switch, vent, gas valve and, behind that, the burner are all accessible when the outside cover is removed.

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