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Thanks for the excellent idea. We have a 2017 Citation Sprinter and the AC unit is a bit more forward but I think there is enough room to add to more vents into the duct work. Did you notice the airflow decrease to the over bunk vents after installing these?
I've done a lot of work trying to get those to blow more air. The problem is the flex tubing was leaking and the AC blower box was leaking so I HVAC taped the entire inside of the blower box. I also had gaps where the duct work connected to the blower box and air was blowing into the ceiling there and where the transition is to the flex tubing which goes to the bunk vents. I foamed and taped the gaps which helped. I think part of the issue with the over bunk vents is that the flex tubing is larger in diameter than the normal ducting so you loose a lot of air pressure. Also, the flex tube termination boxes over the bunk are large in volume so I cut and taped flashing and installed it in those boxes to reduce the volume and increase air pressure. About doubled the flow out of the front boxes. This could also be done with cut foam.
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