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SandwichBear
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# Posted: 3 Dec 2013 01:37pm
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I just spent $125 on a 28" chimney extension for a Dickinson P9000 heater. This seems like a case where simple commonly available materials have a huge markup because they are guaranteed for a very specific niche.
Dickinson's chimney is 2 1/2" diameter with a 1 1/2" diameter tube inside. The chimney is flexible, and the two tubes are separated by four coiled springs wrapped around the inside tube, which keeps them from touching.
My question is whether inexpensive steel tubing could be used instead. If a 2 1/2" tube and a 1 1/2" tube could be found with inside diameters to fit snugly against the flue collar, would this be a working alternative?
I know that the tubing's wall thickness would be a factor. Also, I know that steel will rust. But - if the wall thickness (thinness) is appropriate, and the tubing is sprayed with high-temp engine paint, maybe it would work well.
I know this seems like a lot of effort to save fifty bucks. But 1) what's the fun in doing things the easy way? And 2) I think a straight pipe through the ceiling would look nice. And, well, 3) I'm just endlessly curious.
Here's the tubing I was looking at: Six feet of this. (It comes in 1 1/2" too.)
Maybe I'm missing some important considerations. I would not be surprised.
Thanks if you read this and would like to indulge me.
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razmichael
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# Posted: 3 Dec 2013 01:52pm
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Not sure on the pipe but the manual does state The maximum total length of the flue exhaust pipe can be 56" only". It is designed for a boat after all!
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Truecabin
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# Posted: 4 Dec 2013 07:26pm
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corrugated flows a smaller diameter than the diameter you measure its like a flue with creosote
maybe the stove needs to limit the draft and if you use a longer pipe it will draft to much
id send a diagram to the mfr and ask
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Dekagoldwingers
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# Posted: 18 Dec 2013 12:52am
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The internal tubing has to be stainless, because the creosote generated by the fire is caustic. It should also be shiny to prevent creosote buildup and of adequate thickness to prevent distortion under extreme heat of a chimney fire. Be careful when trying to create something that gas been engineered to do a job.
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