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Country Discussion Topics
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Wood burning furnace question
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Ray    Posted 04-04-2003 at 10:40:35       [Reply]  [No Email]
I got a wood furnace in my wifes green house and I had single wall exhaust pipe for a smoke stack. Well it would run this black stuff down the side of it and leave marks on the green house. Well somebody told me I needed insulated triple wall. I installed the stainless type and it still does the same. I am burning dried wood and it is burning in the burn zone on the temp meter which I installed on the stack on the inside of the green house. Any ideas why it is still doing this.

rhudson and 2 cents worth    Posted 04-05-2003 at 16:48:36       [Reply]  [Send Email]
just want to throw what little i know in. when you burn any hydrocarbon fuel (coal,gas,wood, what ever) the products of combustion will be carbon dioxide and water vapor (steam) if the temperature anywhere in the stack falls below 212, the steam will condense into water. thats not the end of it, the water will combine with the co2 and make a carbolic acid thats pretty effective on the stack metal. it will happen with dry wood also (just not as bad). every time i run our water stove on a very low fire for a day or so i run into several problems including stopping up of the stack.

DeadCarp    Posted 04-04-2003 at 19:14:25       [Reply]  [No Email]
Yup, either rain and soot are mixing or you're trying to burn too slow and tarring up the pipe so add air. Or else that tar will burn very hot once it gets lit.

If it's rain Ray, the easiest fix would be to reverse your stovepipe (like a stack of paper cups) so any water stays inside and goes to the stove. Of course, in England they lap the stovepipe like upside-down paper cups and that works too, except rain runs down the outside. You can make good triple-wall yourself, for a fraction of the store-bought cost. The idea is - when the inside pipe starts getting warm, it draws heat up the second gap which brings outdoor air DOWN the outside gap, so leave the middle layer off the bottom so it can circulate.

On my furnace I use 6" for the smoke itself and have that slid inside an 8" stainless one. That way the crud goes back in the stove and nowhere near that purty pipe.

Ludwig    Posted 04-04-2003 at 10:47:46       [Reply]  [No Email]
Rainy lately?
Sounds like a water leak coming in the pipe and bringing soot. Pretty common. Needs to be fixed though, not good for your stove or the pipe.

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