I do not use foul language, but I was sure thinking a lot of it this evening.
I went by my house (in construction) to check on the rough-in work my HVAC contractor was supposed to finish today.
The air handler and all the duct work is in the unfinished basement (conditioned space). The return air is supposed to come through a framed 18" x 18" chase that I had the house designer and framer install in a central closet. There is a short run of 14" flex duct from the floor of the chase to the return plenum on the air handler right underneath. I told the HVAC contractor that I wanted a couple of return air vents high up on the wall on two sides of this framed chase.
The HVAC installer sealed the top of the chase, and then added the frames for the two return air vents to the framing. The house is supposed to be ready for inspection and drywall, so they are obviously planning on an unlined return air chase. The expletives started at this point.
One of the two return air vents is so far off center of the chase that it overlaps the adjacent wall cavity by several inches. Both return air vents are about 1/3 blocked by the existing framing.
I have spent a LOT of money and hundreds of hours trying to make my house as air tight and efficient as possible. And the HVAC installer obviously hasn't got a clue. His answer is obviously going to pull return air out of the attic, and he doesn't seem to have the slightest care that might not be a good idea.
Calling them back out there to fix their mess seems like a lost cause. If they are that clueless, why would I expect the next round to be any more acceptable. It seems that any time I give them any choices in how the project will go, they find a really horrible cheap answer.
So, I am hoping I can find some place open on a Saturday morning that sells duct board so I can line the chase half way properly.
If I can't get the duct board, what are my other code legal choices for lining a return air chase?
If I find no other answer, I might resort to creating a drywall liner on the inside of the chase.