Hi Tom,
If it is like mine, it is the return air for the coach aux heater, which operates off the engine coolant.
If your filters for your basement air are located under the bed, recommend you check there for plastic remnants also. Had quite a bit under mine, restricting airflow to the indoor coil.
Happy Camping.
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Dan & Sharon (Zena-Our Yorkie Puppy)(Kasey-Our Yorkie Puppy RIP 9Jan05-26Jul17) On the Road (2012 Journey 36M, 2020 Chevy Equinox)
USN-Ret ('65-'93) Fulltimers, Class of 2012
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