Question on Defiance woodburning stove

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My son bought a Defiance "solid fuel" woodburning furnace at an auction, and wants to set it up outside his home (heat piped in). Problem: the stack(?) coming out of the top is heavy steel or iron, and measures 8 & 1/4 inches in diameter. Every plumbing or stovepipe company we've called say that stovepipe ONLY comes in 1 inch increments - in other words, it must be 8 inches or 9 inches. An 8 inch stovepipe fits INSIDE this stack coming out of the top of the furnace, so that won't work - he's afraid he'll get lots of smoke leaks, etc.

Is the only solution to have an adapter custom built to go from 8 & 1/4 inches down to 8 inches? (We've inquired, and that would take weeks and cost more than the stove cost at auction!) I've looked on the net for Defiance stoves and found nothing. What would you do?? Thanks for any help.

-- Bonnie (chilton@stateline-isp.com), December 05, 2001

Answers

Get a piece of sheet metal about 8 inches wide and 27 inches long, coil the metal around the existing stack as tight as possible and mark where it laps itsself, take it off the stack and use pop rivits to attach it to itsself making an open ended cylinder shape. Beg, borrow, steal, or buy a sheet metal crimper tool, its like a heavy pliers with 3 jaws/teeth on one side and 2 on the other and makes a corrigated pattern until it reduces enought to fit inside the factory made stack pipe or cap. Recommended thickness of sheet metal is around 22 gague. Take a plate of fresh warm cookies to the sheet metal shop right about lunch time if you don't want to buy the $15 to 20 dollar crimping tool, this works better yet at a construction site, where duct work is being installed.

-- mitch hearn (moopups@citlink.net), December 05, 2001.

The "Vermont Castings" make a defiante stove and are still in business. However their model defiante is an inside stove and is airtight and a wonderous thing to use and work with. I hope you have such a model, if so you will be wonderously pleased. Is so, they make replacement parts for their models.

-- susan norfolk/wy (susan_norfolk@yahoo.com), December 05, 2001.

My stove pipe fits inside on my stove and i dont have eny problems. but if its out side what make the dif? you can get putty that will work for that if its to loose. Bob se,ks.

-- Bobco (bobco@kans.com), December 05, 2001.

I assume you're talking about an outdoor wood-burning furnace. The kind of furnace that looks like a little metal shed. These furnances never have a high stack and there is a reason for this. The furnaces are made to slow burn unseasoned wood. Consequently, very much creosote can be produced. It the stack was high, the creosote would condense on the inside of the stack and a chimney fire would be a common occurence. With a short stack, the chimney stays warm and creosote does not condense. If you still want to increase the height of your stack, you'll need Schedule 20, "8-inch" steel pipe. According to this link, Steel Pipe Dimensions, 8-inch Sch. 20 pipe has an inside diameter of 8 and 1/4 inches and an outside diameter of 8 and 5/8 inches. The wall thickness is 1/4 inch. If we're talking about an outdoor wood-burning furnace here, I'd advice against increasing the height of its chimney. --Happy trails, Cabin Fever

-- Cabin Fever (cabinfever_mn@yahoo.com), December 06, 2001.

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