Did some "unscheduled maintenance" today. I discovered a while back that I was not getting any airflow out of the bathroom heat vent.... None. Took a flashlight and looked into the vent, and sure enough, the duct had separated from the vent.
When I took the little rack off the front of the vanity, discovered the following:
1. For those who thought that perhaps there was wasted space in there, there really is not. Duct, plumbing, wiring and the recessed wash cloth rack take up almost all of the room. You will be glad to have space to maneuver under there if you ever want to do some mods or repairs.
2. The reducer that attaches the duct to the vent is metal, really heavy for the application, and just barely fits if everything is lined up just right during the build. In my case, the plumbing vent angles out away from the front wall just slightly, and it's just enough to make the reducer not fit. The joint was held together with foil duct tape, and the weight caused it to separate.
3. Found a very light weight plastic reducer on Amazon that fit the situation much better. The joint between the reducer and vent still not a good fit, (meaning it's just a tad too wide to slide into the vent), but with a couple of good wraps with foil tape it's on securely. And feather weight, so no danger that it will come loose.