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jjpclev 02-26-2010 07:38 AM

plastic ductwork vs. metal: acoustic duct liners
I have a couple questions about running some new ductwork in my existing home. I have read a bit on forums about the possibility of using plastic ductwork, versus the typical sheet metal. Does anyone have any advice on this. I am considering re-routing one of my existing ductwork runs (just the register, not the return side ), and was considering using plastic ductwork. I am also concerned about ductwork noise. I have read a bit about the use of acoustic duct liners. is there ductwork avail with this already installed. I would be running my ductwork through an existing interior wall ( b/t 2 existing studs ). also, I want to move the exising run w/ the register from an exterior wall to an interior wall. I thought that it might be more efficient ( interior wall versus exterior wall ), as the interior wall are much warmer that an exterior wall. but my question is about positioning of the register. if i were to move the run and have the register on an interior wall, it would now be on the same wall as the return ( although the returns are near the ceiling, and I am planning on installing the regester near the floor of the room ). also, this is for a second story bedroom in the NW corner of my home. I live in cleveland, ohio, so this room is generally the coldest in my home. it get the brunt of the cold winter winds. any thoughts, suggestions, would be greatly appreciated.

cheers. Jim

DangerMouse 02-26-2010 08:44 AM

Hi and welcome to the forum.

Funny you should ask this....
I was just here:
reading about plastic ductwork....
why can't you keep the register on the farther wall?
you'd want it as far from the cold air return as possible, I would think.


jjpclev 02-26-2010 10:44 AM

thanks for the link. I will have to take a closer look at it. as far as the my repositioning the register, I simply wanted to remove it so that I could eliminate the sofit in the room below. and I kinda thought having the register within an interior wall would be more energy efficient. but I honestly don't know anything about positioning of registers relative to the returns.

thanks again for your reply.


DangerMouse 02-26-2010 10:48 AM

NP... and I certainly agree with your logic here as well.


Originally Posted by jjpclev (Post 406261)
I thought having the register within an interior wall would be more energy efficient.


beenthere 02-26-2010 06:45 PM

Having a supply register on teh interior wall makes the room tend to be cooler in the winter. And warmer in the summer. As the exterior wall is not heated or cooled.

In the winter. As soon as the heat shuts off. Your body radiates heat to that cold exterior wall. making you feel cold.

In the summer. as soon as the A/C shuts off, that hot exterior wall radiates heat to you, making you feel hot.

What you want to do. Was done a lot in the 50's. And they found out, that people were not as comfortable with their stat set to 70. And would raise the stat o 47 or better to feel warm.

jjpclev 02-26-2010 07:29 PM


thanks for the info. excellent info.


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