Re: Contractor sheetrocked over my AC Vents
Since you say you can see where the ducts branch off and head for the first floor, that gives us some clues as to where the outlets might be.
The ducts probably go straight down through a void or wall cavity, then follow a joist cavity. It's unlikely that the duct would go through a stud or joist, though if small enough, they may. So if you can figure out which way the joists run, identify the cavity (joist bay) between the floors that is directly below the visible part of the duct. The outlet may be somewhere along this joist bay, most likely close to the exterior wall.
There's been so much chatter here that I haven't got it straight whether it's a low-velocity (big ducts & outlets - ~8" dia. or 3x10) or high-velocity (large main duct with small hoses and small outlets, about 2" dia.). It sounds like you might have a high-velocity system, but I'm kind of confused.
If it's a high-velocity system, it's quite possible that the heating contractor left hoses in the ceiling intending that the sheetrocker would make a hole and poke the hoses through. The heating contractor would then come along later and install the vent/flanges. If the sheetrocker is unfamiliar with this system, it stands to reason they wouldn't know to poke the hoses through. There would be no bulges in the ceiling, and no metal "cans" to detect with a metal detector. In this case, finding the ends of the hoses will be nearly impossible.
You may be able to run an electrician's fish tape into the duct and have someone listening to see if they can hear when it comes out and rattles around on the sheetrock. Then you would cut a hole just a hair larger than the hose and fish the hose out, attach the vent/flange, and be happy. Be careful; you could end up poking a hole in the hose and that wouldn't be good.
ANYWAY, that's the way I'm assuming it could be done. I've *NEVER* dealt with a high-velocity system personally; I've only seen them, and not in great detail. I'm just throwing this out there as an idea for the masses to consider and pick apart.
The "Senior Member" designation under my name doesn't mean I know a lot, it just means I talk a lot.I've been a DIYer since I was 12 (thanks, Dad!). I have read several books on various home improvement topics. I do not have any current code books I can refer to. I was an apprentice plumber for two years.