Posted: 12/4/2025 12:45:07 AM EDT
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I purchased a little Vozelgang Box Stove last summer and am about to hook it all up and use it in my uninsulated, all metal shop building. I know you are supposed to use class A chimney pipe for outside the structure but dang it’s expensive! My question is, can I get by with just running black stove pipe all the way instead of the class A? I’d have a fire going maybe twice a week for about 4 hours at the longest. |
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What you run depends on where the pipe exits the structure. Inside you can go up as high as you want with single wall black pipe. You either go straight up through the roof or use 90 degrees to turn toward the wall and 90 degrees to go up from there . The pipe that goes through the two piece thimble that penetrates the wall or roof is a specialized double wall insulated stainless pipe. If you penetrate the roof there is a cone shaped flashing that goes around the pipe so rain doesn’t come in. At the top there is a rain cap with spark arrestor. There are support brackets and you may need guy wires to support the chimney above roof level. Inside black single wall Close to anything that burns = double wall stainless Two piece thimble with air space penetrates the wall or roof . Outside. Double wall insulated stainless. Top of pipe is above the roof. Had one in a metal shed at the farm black pipe up, hole in tin roof, black 90 that worked for a while until I did it right. |
| If it was my all-metal building, that's for sure how I'd do it. Black pipe all the way. |
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Lots of wood stoves have caused fires. The fires usually come from the chimney. Do it right or not at all. Depending on the height, you can probably safely use single wall pipe till it penetrates the roof. Then, run a section of double or triple out the roof. Single wall pipe will get hot and you won’t have a way to seal it to the roof to prevent leaks. The double or triple insulated pipe will allow you to install a rubber flashing around the pipe. Also remember about chimneys….they depend on heat in the pipe to draw the smoke out of the chimney. If the chimney pipe cools too fast (like it will with single wall) your chimney won’t draw properly and your stove won’t work. As you have found, the chimney is the expensive part of a stove install. The stove itself is cheap. |
"It behooves every man to remember that the work of the critic is of altogether secondary importance, and that, in the end, progress is accomplished by the man who does things."
Theodore Roosevelt
Theodore Roosevelt
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Originally Posted By JHMC79: That’s how one of my friends I go to church with rigged his up. This is what I’m going to run with also. Don’t “rig up” a chimney. Do it properly. Yes properly can include single wall black pipe. But, you need double or triple wall at least where it exits the roof. |
"It behooves every man to remember that the work of the critic is of altogether secondary importance, and that, in the end, progress is accomplished by the man who does things."
Theodore Roosevelt
Theodore Roosevelt