I have one in my coach that is the same. It turns out mine is the inlet for the Ford cabin filtration system. The filter is in a box in the engine compartment. Now there are a few minor differences between our coaches so you'll have to see if this is the case for your coach and model.
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Dave
US Army (Ret)
2020 Entegra Accolade 37TS
2019 Jeep Grand Cherokee Trailhawk (Toad)
FMCA - F432054
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