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Old 02-06-2010, 09:31 PM   #1
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How to duct heat into a closet?


I find my coat closet gets very cold as it is in a corner, so I would like to duct a bit of heat into it from the furnace. I don't want a full size duct as that would be overkill, but something maybe the size of a sink PVC pipe. Just enough to say there's a bit of heat going in there.

Can I actually use PVC or would that be wrong? I've never seen pvc used for air before, other then the intake/exhaust of the furnace. I don't think they make metal ducting that small, or do they? I'm also not sure what I'd do for the grill but suppose I could find something that looks half decent. The floor is tile and it gets lot of dirt from shoes so I would probably put it in the wall and not in the floor.

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Old 02-06-2010, 09:48 PM   #2
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How to duct heat into a closet?


You can use PVC. And they do make 4" duct.

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Old 02-06-2010, 10:59 PM   #3
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How to duct heat into a closet?


You want to heat a closet ??
Whatareyacrazy?
That's why they are usually on an outside wall
I just ripped apart 2 closets & put in new R13 insulation
Keeps them warmer
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Old 02-07-2010, 04:46 AM   #4
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How to duct heat into a closet?


Red squirrel PVC is not some thing I would use. There is just something about putting heat thru plastic that is not healthy, The PVC can aspirate or out gas fumes in the presence of heat. And some of the chemicals are known disease
carrier.

If you want a new duct run stick to flex or four inch hard pipe.

Good luck.
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Old 02-07-2010, 05:58 AM   #5
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How to duct heat into a closet?


Use 4" pipe. When you cut in the take-off to the main trunk: cut a hole smaller than the take-off and just screw it down instead of cutting a full size hole and folding the tabs in.
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Old 02-07-2010, 09:45 AM   #6
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How to duct heat into a closet?


Quote:
Originally Posted by hvaclover View Post
Red squirrel PVC is not some thing I would use. There is just something about putting heat thru plastic that is not healthy, The PVC can aspirate or out gas fumes in the presence of heat. And some of the chemicals are known disease
carrier.

If you want a new duct run stick to flex or four inch hard pipe.

Good luck.
It would have to be pretty hot for it to out gas.

PVC has been used for underground duct for many years.

http://www.harrisonplastic.com/pvcductspecs.html
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Old 02-07-2010, 11:36 AM   #7
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How to duct heat into a closet?


Quote:
Originally Posted by beenthere View Post
It would have to be pretty hot for it to out gas.

PVC has been used for underground duct for many years.

http://www.harrisonplastic.com/pvcductspecs.html
Been, everything aspirates or outgases. The words are interchangeable.

Just as you inside of your car's wind shield becomes filmy because of the synthetic and petrol based plastic give off fumes. In my circles we call it out gassing. It may not be dictionary definition correct, but like so many words in the English language it's misuse has been accepted for the context it is used.
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Old 02-07-2010, 11:40 AM   #8
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How to duct heat into a closet?


Quote:
Originally Posted by beenthere View Post
It would have to be pretty hot for it to out gas.

PVC has been used for underground duct for many years.

http://www.harrisonplastic.com/pvcductspecs.html

Deinition :
Outgassing (sometimes called offgassing, particularly when in reference to indoor air quality) is the slow release of a gas that was trapped, frozen, absorbed or adsorbed in some material.[1] It can include sublimation and evaporation which are phase transitions of a substance into a gas, as well as desorption, seepage from cracks or internal volumes and gaseous products of slow chemical reactions. Boiling is generally thought of as a separate phenomenon from outgassing because it occurs much more rapidly.
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Old 02-07-2010, 11:45 AM   #9
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How to duct heat into a closet?


Media Center > In the News
January 18 - Fixit: A whiff of vinyl (Minneapolis Star Tribune)
By Karen Youso
Q: I have a new vinyl shower curtain and was given a vinyl tote bag, perfect for traveling. However, both of them stink terribly. What causes this and what can I do about it?
A: Vinyl products (PVC) stink because they contain volatile organic compounds. VOCs are carbon-containing chemicals that are volatile enough to evaporate at room temperature. This process, called outgassing, is also a problem with building products such as plywood, particleboard, carpet and pads, paints, stains and glues.
Outgassing odors are most noticeable when products are new, but diminish over time until they finally disappear. A shower curtain can outgas for a month or longer, for example, depending on conditions. High temperature and humidity will speed up the release of VOCs.
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Old 02-07-2010, 11:49 AM   #10
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How to duct heat into a closet?


Not all vinyil/PVC products are made the same way.

PVC duct has been in use for a long time.

Galvanized sheet metal puts off harmful fumes if it gets too hot.

There is NO safe product made today for anything.
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Old 02-07-2010, 12:02 PM   #11
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Quote:
Originally Posted by beenthere View Post
Not all vinyil/PVC products are made the same way.

PVC duct has been in use for a long time.

Galvanized sheet metal puts off harmful fumes if it gets too hot.

There is NO safe product made today for anything.

Been I hate to disagree with you cause I consider you good guy and very knowledge.

But the fact of the matter is all PVC producst aspirate or out gas at room temp. There are low out gassing cables for facility usage.

I do not know about any duct systems made of PVC but they would be illegal here.
We have seen bladder type trunks where th air exchanges are so high th VOCs would not build up.

PVC is a definitely not some thing I can agree on for the conveyance of air
in a a residential setting.

If you have pics of a resi PVC duct system or a link I would appreciate your sharing it with me.

I don't know everything, but when it comes to safety and I know I am right I will debate it all day.
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Old 02-07-2010, 12:11 PM   #12
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How to duct heat into a closet?


The link I posted earlier is for PVC duct.
Here is another one. http://www.harvel.com/duct-systems.asp
And here http://www.hranec.com/ductwork-pcd.htm

Here its used to coat metal duct http://www.spiralmfg.com/chemical.htm

Another application of PVC for ducts http://www.spiralmfg.com/chemical.htm


Its also used on high velocity systems. And is commonly used for underground duct systems.

Your codes specifically name PVC as not allowed for a duct system?
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Old 02-07-2010, 12:31 PM   #13
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How to duct heat into a closet?


Quote:
Originally Posted by beenthere View Post
The link I posted earlier is for PVC duct.
Here is another one. http://www.harvel.com/duct-systems.asp
And here http://www.hranec.com/ductwork-pcd.htm

Here its used to coat metal duct http://www.spiralmfg.com/chemical.htm

Another application of PVC for ducts http://www.spiralmfg.com/chemical.htm


Its also used on high velocity systems. And is commonly used for underground duct systems.

Your codes specifically name PVC as not allowed for a duct system?
No only one hundred percent PVC resi duct system. The inspector told me he disallows them although I can't say I have ever heard him tell me any one has tried installing one yet.

We have a clause in our state code that allows the inspector to reject any material if he feels it is not safe for the general public to use.

In a neighboring city the inspector rejected a UL rated foil backed card board panels that were being sold as cold air panning.

The whole county soon got behind that inspector and had the state board banned it completely.

When the tankless water heater were first introduced here the state had to debate whether it fell under the boiler section of the code or just plumbing.

End of story they compromised and said the gas guys had to install it and the plumbers had to plumb it.

Now the cities are issuing permits for complete install to both trades.
"Don't Ask Don't tell".

But PVC as a home duct system...no.

For underground use as an exterior coating is allowed but no metal duct coated with PVC on the interior is accepted.
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Old 02-07-2010, 12:38 PM   #14
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How to duct heat into a closet?


So its not against code per say.
Just your inspectors don't know anything about it. So they reject it.
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Old 02-07-2010, 12:45 PM   #15
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Quote:
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So its not against code per say.
Just your inspectors don't know anything about it. So they reject it.
Been we got one of the best bldg inspection and enforcement division in the country.

So he knows what he is doing. I'd rather er on the side of safety now than find out twenty years down the line somebody got cancer from my job cause i didn't use metal.

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