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How hard is it to add a return duct to my heat/air system? SA Development 08-02-2005
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Posted by SA Development on August 2, 2005, 10:38 am


Hi everyone,

I've got a room that is my home office and I have to keep the door shut in
it all day. With the door shut, there is only a vent and no return air duct
in the room so the room gets warm during summer. I can see the cardboard
looking (not metal) ductwork and the return air looks like a box with silver
covering and the air ducts themselves are through a round silver flexible
line.

Here are my questions:

1. I think I can add the duct to my room pretty easily. How easy is it to
work with this cardboard ductwork? What tools will I need? Do I just need
to splice my return duct into the existing one? I have one not too far from
my office that is one of 2 main return ducts (in the hallway).

2. Should I consider adding another vent as well?

Thanks,

Alan




Posted by SQLit on August 2, 2005, 9:08 am



> Hi everyone,
>
> I've got a room that is my home office and I have to keep the door shut in
> it all day. With the door shut, there is only a vent and no return air
duct
> in the room so the room gets warm during summer. I can see the cardboard
> looking (not metal) ductwork and the return air looks like a box with
silver
> covering and the air ducts themselves are through a round silver flexible
> line.
>
> Here are my questions:
>
> 1. I think I can add the duct to my room pretty easily. How easy is it
to
> work with this cardboard ductwork? What tools will I need? Do I just
need
> to splice my return duct into the existing one? I have one not too far
from
> my office that is one of 2 main return ducts (in the hallway).
>
> 2. Should I consider adding another vent as well?
>
> Thanks,
>
> Alan

Adding anything to the return air supply should be looked at by a pro.
I have never seen cardboard duct work. Fiber yes but not cardboad. The fiber
was made from fiberglass and has not been used much where I live cause of
health concerns.




Posted by SA Development on August 2, 2005, 3:08 pm


Hi,

> Adding anything to the return air supply should be looked at by a pro.
> I have never seen cardboard duct work. Fiber yes but not cardboad. The
> fiber
> was made from fiberglass and has not been used much where I live cause of
> health concerns.

To be honest, I'm not sure what it is. I know that it is not metal and has
a silver foil outside to it.

Thanks,

Alan




Posted by Frank Boettcher on August 2, 2005, 11:38 am


Calculate the area of the supply duct then cut the same area from the
bottom of the door. for instance if you have a six inch internal
diameter duct feeding your office the supply area would be 28.26
square inches so if your 30" door has an inch gap above finish floor
you should have enough return area. an eight inch diameter duct would
require about 1-3/4" above finished floor level. If you cannot get
enough by doing that put a return grill in your door. a lot simpler
than putting in a return duct.

On Tue, 2 Aug 2005 10:38:26 -0500, "SA Development"

>Hi everyone,
>
>I've got a room that is my home office and I have to keep the door shut in
>it all day. With the door shut, there is only a vent and no return air duct
>in the room so the room gets warm during summer. I can see the cardboard
>looking (not metal) ductwork and the return air looks like a box with silver
>covering and the air ducts themselves are through a round silver flexible
>line.
>
>Here are my questions:
>
>1. I think I can add the duct to my room pretty easily. How easy is it to
>work with this cardboard ductwork? What tools will I need? Do I just need
>to splice my return duct into the existing one? I have one not too far from
>my office that is one of 2 main return ducts (in the hallway).
>
>2. Should I consider adding another vent as well?
>
>Thanks,
>
>Alan
>



Posted by SA Development on August 2, 2005, 3:24 pm


Hi Frank,

> Calculate the area of the supply duct then cut the same area from the
> bottom of the door. for instance if you have a six inch internal
> diameter duct feeding your office the supply area would be 28.26
> square inches so if your 30" door has an inch gap above finish floor
> you should have enough return area. an eight inch diameter duct would
> require about 1-3/4" above finished floor level. If you cannot get
> enough by doing that put a return grill in your door. a lot simpler
> than putting in a return duct.

This was my first idea, but I use the office to work in and I have to keep
the noise of a toddler out of it, so I can't cut the door or put a door vent
in.

Any other ideas?

Thanks,

Alan




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