Our home has a hip roof with 3 dormers. The upstairs is essentially a T-shaped space with the bottom and one of the sides of the T separated into two bedrooms
The HVAC in our home is completely plumbed with flex hose.
Upstairs, we have a 1/2 bath that is best suited to hobbits. We want to move the bathroom to the other side of the top of the T where there's more space. Currently, some of the HVAC ducting runs through that space so to create a bathroom there, we'll need to reroute the ducting. I think I've thought of a way to do that, but since I don't know jack about hvac ducting, I thought I'd check with the brain trust and see if there are any major flaws with my plan.
In the diagram below, on the left side, there are 3 ducts (red lines "point" to them). One runs through the corner of a room where a portion of the corner was enclosed with drywall at a 45º angle. It then pops out into the attic area and runs over to the vent in the ceiling of the downstairs bathroom. The middle most vent is in the opposite corner of the room. There's a wooden box (wart) built in the corner of the room that houses that vent and the feed for it. The existing ducting pops down from above the upstairs rooms into corner attic areas, and then splits off in a Y to feed the 2 downstairs vents.
My thought is that I add another 45º angle bit of drywall and re-route the existing ducting down through the corner of the room similar to the other side. This would require a Y or T immediately above that middle vent to break out the ducting to go to the bottom most vent. It seems to me like the best option would be to have the duct feed a "wye" and then one end of the wye go to the middle vent and then more flex hose go to the bottom vent. Adding the drywall to that corner at a 45º would make the two corners match except for the wart. Then the theory is that I'd built something like a window seat that would run all of the way across the wall that would essentially hide the wart by integrating it into a feature. I should be able to make the wart shorter because right now, it's a little higher than the bottom of the windows.
Do you gents that are familiar with HVAC ducting have any opinions on whether this would be acceptible or for some reason, a really bad idea?
a not completely accurate or scale representation of the upstairs as it is now.
Showing the difference in how we want to reroute the one duct to the 2 vents.
I think this might be the best bet if I can get it plumbed directly to the top of one vent.
In the background in the corner is the wart (covered in stained and finished beadboard paneling).
This is the 45º corner that the one duct is currently run through.
