I have a 2011 Cardinal 3150rl. Can I install additionl vent under rear window. I Upgraded to 42k btu furnace.
RV Airflow System AirDirect Replacement Air Vent
Heat Air Conditioning Vents
Question ID: 6518227 Status:
Open Dec 03, 2025 - 10:10 AM
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Answer
Dec 04, 2025 - 10:59 AM
Technically, yes—you can add a vent under the rear window, especially with products like the RV Airflow System AirDirect Replacement Air Vent, as long as there’s a nearby duct in the floor or underbelly to tap into. Just be sure to keep the vent in the floor or cabinet area (not a thin wall), use proper materials, and maintain duct balance. However, you should only do this after confirming your upgraded 42k BTU furnace isn’t already overloading the original ductwork and that you can install the new vent correctly, ensuring efficient airflow and system safety.
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