Mine is home made. You have to be able to adjust how much air is going in each direction. For my unit, one duct services only 1 vent in the front bedroom. The other duct services 3 ducts in the main cabin and bathroom. So I set mine to send about 75% of the airflow to the duct with more vents. I didn't have a better either, I just judged by feel.
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2015 Jayco WhiteHawk 28BHKS Summit Edition
2021 Ford F-150, 4x4, 3.5L Ecoboost, Max Tow
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