Heat vents in 2150rb bedroom

[HeidiHome]

Just fired up the furnace for the first time in our 2150rb to prep for trip to Yellowstone tomorrow. I have heat coming out of the lower heat (brown) vent in the bedroom, but nothing is attached to the brown vent a few inches above it. I can pull out the drawer under the kitchen sink to see from the other side that nohing is atached to that higher vent but I am not sure how to pull out the left side of the cabinet blocking my view to see if the heating duct is detached o it is just a return vent without any ductwork. Has any other 2150rb owner run across this question? Thank you!

[WhittleBurner]

We don't have an Imagine but similar questions have been asked about other models. It could just be a return vent for the furnace. You could be looking in the right places though by looking at the vents. There have been reports of vents not attached or twisted so they restrict air flow.