gmbobnick Posted January 9, 2017 Share Posted January 9, 2017 I am going to put in a side-draft chimney system for my coal forge, and understand that 12” diameter is recommended. However, I have to question the cost I am seeing for that size pipe. Near as I can tell single wall 12” stove pipe is easily 10x more expensive than 8” single wall? ($140 vs. $14 for a 3’ stick) Am I looking at the right thing? I don’t want to take any shortcuts, but neither do I want to pay hundreds more if not needed either. Just how hot is this pipe going to get? Quote Link to comment Share on other sites More sharing options...
Buzzkill Posted January 9, 2017 Share Posted January 9, 2017 You can always buy 6" stove pipe and "zip" 2 sections together to make 12" pipe. Quote Link to comment Share on other sites More sharing options...
Charles R. Stevens Posted January 9, 2017 Share Posted January 9, 2017 Look at the price of 6", and just zip two together. Makes 12" pipe pretty dang cheep. Quote Link to comment Share on other sites More sharing options...
gmbobnick Posted January 10, 2017 Author Share Posted January 10, 2017 Hmmm...I should of thought of that! Thanks! Quote Link to comment Share on other sites More sharing options...
ThomasPowers Posted January 10, 2017 Share Posted January 10, 2017 As a forge chimney doesn't get real hot, I've used spiral seamed galvanized ductwork that I bought 2nd hand from a Habitat for Humanity ReStore that was moving. US$4 for a 10" Diameter 10' long piece---I bought 2. Quote Link to comment Share on other sites More sharing options...
Millhand Posted January 20, 2017 Share Posted January 20, 2017 Pop rivet or screw the seams together. Top n bottom of every length before you put them up to save some frustration! Quote Link to comment Share on other sites More sharing options...
Glenn Posted January 20, 2017 Share Posted January 20, 2017 Metal screws work as connecting devices for the diameters of thin tin chimney sections to keep the sections from opening back up. Use to connect section to section to make longer lengths that can not come apart later. Quote Link to comment Share on other sites More sharing options...
marcusb Posted January 20, 2017 Share Posted January 20, 2017 Where are you pricing it? Menards has 5' sticks for 20 "ish" dollars, local hvac shop sold me some for the same price. Quote Link to comment Share on other sites More sharing options...
johndilsaver Posted February 11, 2018 Share Posted February 11, 2018 I just thought I'd note that this discussion gave me several good ideas. Quote Link to comment Share on other sites More sharing options...
Frosty Posted February 11, 2018 Share Posted February 11, 2018 Don't line the seams up between sections it won't want to pop open as easily, rivet or screw the sections together and it can't open up. No need to pay extra for unplated stove pipe anywhere but directly over the fire and if you have a large enough hood to let the exhaust cool a bit you can go galvy all the way. Coal forges don't make that much waste heat, it's part of the reason you need an oversized stack nor is multiple wall desirable. Frosty The Lucky. Quote Link to comment Share on other sites More sharing options...
Irondragon Forge ClayWorks Posted February 11, 2018 Share Posted February 11, 2018 When the flues at ESSA needed replacing, Debi had 10 inch seamless spiral HVAC duct work installed. It is working very well. Quote Link to comment Share on other sites More sharing options...
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