If there is no fan in the vent I would try having someone hold a finger at various parts of the vent to see where the noise is coming from. If you have a fan you may need to drop it down to do it. You most likely have a wind rattle.
Happy Trails!!!
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Tony & Ruth........... FMCA#F416727
2016 London Aire 4519, Freightliner chassis, Cummins ISX, 2018 Jeep Wrangler Unlimited, Blue Ox Avail with AF1. TST 507 TPMS
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