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Mark ... there is no cabin pressurization by the furnace as Dutchmensport said, it will only blow what it can suck in. What we both are trying to get across to everyone is ... there is no dedicated return duct in any of out RV's. The furnace just sits in a space provided per floorplan and draws air from that space which is by design also connected to the underbelly and pass thru storage. Loose the idea that the vents under the steps are the sole point of intake air for the furnace's air recirculation.
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