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Old 02-07-2010, 11:49 AM   #16
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How to duct heat into a closet?


Been all those ducts are either in ground or industrial app.

Have you seen what happens when PVC is used to vent a dryer?

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Old 02-07-2010, 11:55 AM   #17
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How to duct heat into a closet?


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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.

PVC as a duct has been in use since the early 80's that I know of.
Haven't heard of anyone getting cancer.

If they can't point out a IMC code section. Its their personal opinion. And not a national code.

As far as i know. cali even allows PVC duct. And they have the most codes about carcinogens of any state.
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Old 02-07-2010, 11:57 AM   #18
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How to duct heat into a closet?


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Been all those ducts are either in ground or industrial app.

Have you seen what happens when PVC is used to vent a dryer?
Yes I have.

How many furnaces are you installing that have the same high temp discharge that a clothes dryer does?
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Old 02-07-2010, 12:30 PM   #19
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How to duct heat into a closet?


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Yes I have.

How many furnaces are you installing that have the same high temp discharge that a clothes dryer does?
Tell me how hot the exhaust on a dryer is?

















It sure ain't flue pipe hot.
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Old 02-07-2010, 12:37 PM   #20
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How to duct heat into a closet?


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tell me how hot the exhaust on a dryer is?

It sure flue pipe hot.
On many electric units 155F at the end of the drying cycle.
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Old 02-07-2010, 04:07 PM   #21
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How to duct heat into a closet?


Figured PVC would be a bad idea, so wont do that. I could also see someone mistake it for a drain line when doing an inspection or something, and then follow it and see it go to the duct and be like WTF?

If I can find some 3" ducting I'll do that, if not I never thought of just making the hole smaller when I hook it in, so that's what I'll do. I don't want tons of heat in there, just enough so that my coat is a bit warm. I suppose I could also just install a damper.
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Old 02-07-2010, 04:21 PM   #22
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On many electric units 155F at the end of the drying cycle.
I'm talking gas.

I can hold my hand in that exhaust all day.

Dryer exhaust temps are about the same as 80% furnace supply air..
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Old 02-07-2010, 05:00 PM   #23
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How to duct heat into a closet?


When I had this problem, I glued 1" styrofaom (blue) to the outside wall surface and then covered this with a wall board paneling!
In my case, moist air was condensing on the wall surface, and water was forming on the wall.
It was a successful solution!

Another option would be to install a vent above the door opening, and cut an inch off the bottom of the door, to allow air circulation!
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Old 02-07-2010, 05:53 PM   #24
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How to duct heat into a closet?


If this can happen with a dryer using standard sch 40 PVC than imagine
what can happen when you use PVC as a residential duct system.

The supply air heat combined with household VOCs will cause the interior of the PVC duct to become "sticky" and trap dirt the furnace filter misses.

Some naysayers would point out an 80 or 90% furnace supply air would never get hot enough.
True...assuming perfect air flow, perfect furnace size (capacity in BTU)
perfect filter (always changed on time or one with no restrictive qualities.
Yeah, that's gonna happen when pigs fly ...

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Old 02-07-2010, 06:16 PM   #25
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How to duct heat into a closet?


Guess you don't use flex duct on furnaces either.
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Old 02-07-2010, 06:19 PM   #26
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How to duct heat into a closet?


Only specialized, expensive PVC is used in industrial scenarios.

I do not advocate the use of PVC of any type whether is be used in slab or specialized.

The simple fact is that PVC is a petroleum product and when heated, no matter how it has been manufactured, it will cause fumes that over the long haul will cause health problems.

I point to Plex vent (a plastic supposedly suitable for side wall venting of furnaces) it was recalled because it crumbled soon after installation from the heat of the flue gases.

Plastic tube for in floor boiler heat broke down and leak water under tile floors.
The temp of high efficiency boiler water is about the same as furnace supply air.

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Old 02-07-2010, 06:21 PM   #27
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How to duct heat into a closet?


The following is from the HARVEL website.
They specify pvc for corrosive enviorments only.
http://www.harvel.com/tech-specs-pvc-pipe-40.asp
PVC PIPE - SCHEDULE 40
Click here to download specification sheet
APPLICATION:
Corrosion resistant pressure pipe, IPS sizes 1/8 through 24, for use at temperatures up to and including 140 F.


as can be seen from the above info sch 40 PVC is only good upto 140*f.
The air running thru metal ducts can surpass that with some types of furnace failures.



Would YOU want PVC ducts in your home?
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Old 02-07-2010, 06:26 PM   #28
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How to duct heat into a closet?


But do you use flex duct.
Which is vinyl.
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Old 02-07-2010, 06:40 PM   #29
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How to duct heat into a closet?


Thank you for the the info, hvaclover, I won't even mention the health hazards of plastic water bottles!

Be safe, Gary
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Old 02-07-2010, 06:50 PM   #30
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But do you use flex duct.
Which is vinyl.
I use metal duct. Flex duct is a last resort that I have used twice in 33 years.

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