Marty 579,
To the best of my knowledge, the air vents are simply 2 long, front to back, tubes in the ceiling with air dumps cut into them for the vents along the way.
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2019 F350 SRW with Demco Autoslide
2021 385BR
2018 Smart Trailer
2017 Fully Grown 5 Pound Toy Golden Doodle
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