Sebastian Sundin Posted October 21, 2015 Share Posted October 21, 2015 Hi! I'm still kind of a newbie at this, I started forging this summer, outside, and now winter is approaching and I am thinking about setting up shop indoors.I've got an old barn at my disposal, that actually was used as a blacksmiths shop some 50 years ago, but my grandfather removed the chimney and everything else to use it to store his cars.It would be nice to have a chimney but since it was removed several years ago that is not an option, so I was thinking about the side-draft chimney and looked at Hofis blueprints.There's a bit of draft from the windows, and also from the door, could this be a problem or is it just a good thing?Also, I have got the square tunnel, what bothers me is the pipes he uses, I can get my hands on 6inch pipes but anything bigger than that seems to be pretty hard to find here in Sweden, atleast at a decent price. Will the side draft work with such a small pipe or do I need a wider one? The barn is roughly 6x5m, so 30m2, almost 100squarefeet If I am correct. Quote Link to comment Share on other sites More sharing options...
Charles R. Stevens Posted October 21, 2015 Share Posted October 21, 2015 Zip two 6" together Quote Link to comment Share on other sites More sharing options...
Sebastian Sundin Posted October 21, 2015 Author Share Posted October 21, 2015 Did not think about that, haha, thanks! Quote Link to comment Share on other sites More sharing options...
Charles R. Stevens Posted October 21, 2015 Share Posted October 21, 2015 No problem, lol. Quote Link to comment Share on other sites More sharing options...
Sebastian Sundin Posted October 23, 2015 Author Share Posted October 23, 2015 Turns out that this square tunnel that my friend had was rusted all the way through, with big holes in it.. that wont work!But I was thinking, could you put and old oil barrel through the wall to act as a tunnel? With the tunnel horizontal, couldn't you just attach a 90degree pipe-bend-thingy to the bottom?I'm guessing the part through the wall doesn't have to be square, or does it?And perhaps an oil barrel is too big in diameter, I don't really know.. Quote Link to comment Share on other sites More sharing options...
Charles R. Stevens Posted October 24, 2015 Share Posted October 24, 2015 Try a grease barel, smaller its smaller, then with a bit of work with a sharpie and a ruller you can have the 12" pipe coming in the top of the 14" drum. Quote Link to comment Share on other sites More sharing options...
ThomasPowers Posted October 24, 2015 Share Posted October 24, 2015 (edited) I believe he used square because that's what he had cheap and it's easy to put out the wall. Airflow is better in round pipe of the same area. I myself used 10" round spiral seamed duct because that is what I had cheap; US$4 per 10' length at a ReStore that was getting ready to move. As my walls are sheet metal and I had a large round hole in it already I just stuck a piece of pipe up at 75 deg angle and got to forging.5 attempts to post Edited October 24, 2015 by ThomasPowers Quote Link to comment Share on other sites More sharing options...
Eddie Mullins Posted October 24, 2015 Share Posted October 24, 2015 I built a side draft for my coal forge, my chimney is recycled corrugated tin roofing rolled into a tube, works great. Quote Link to comment Share on other sites More sharing options...
Michael Cochran Posted October 24, 2015 Share Posted October 24, 2015 I built my side draft from sheet metal off an old washing machine and sheet metal screws. Instead of buying a collar I cut several tabs on the top side and folded them up into the chimney pipe which is (for now) a five foot long piece of six inch air conditioning round duct. If I ever finally finish my new shop I'll get a bigger stack even though I really haven't had issue with what I have simply because the forge is going to be a little bigger. Quote Link to comment Share on other sites More sharing options...
Sebastian Sundin Posted October 24, 2015 Author Share Posted October 24, 2015 Thanks for all the info guys, I picked up a square box in the town next to mine, I'm going to work on installing everything next week Quote Link to comment Share on other sites More sharing options...
Charles R. Stevens Posted October 24, 2015 Share Posted October 24, 2015 Good deal, honestly I think drawing a circle the size of your pipe, and one a couple inches smaller, cut iut the center, then cut tabs to the outside circle and bend down. Quote Link to comment Share on other sites More sharing options...
jacob's hammer Posted December 10, 2015 Share Posted December 10, 2015 I'm doing the same thing. Made my square horizontal duct with the sheetmetal from an old furnace. I now wonder how to protect the metal from rusting since it is not galvanized. I can paint the outside. but was wondering about the inside. Could paint that too but will it stick after a while? would i need high temperature paint? Not trying to hijack thread butmaybe sebastian will have similar situation with his new box. Quote Link to comment Share on other sites More sharing options...
Michael Cochran Posted December 10, 2015 Share Posted December 10, 2015 I didn't paint mine. I just used it as it was with the factory paint. I have lost much of the paint off the side ride next to the fire and a little down the length on the fire side. If I was to decide to paint it I would definitely use the high temp spray paint or try some kind of epoxy paint. I'm not gonna worry about it because I'm workin on a new side draft using some 1/4" thick roughly 8" pipe I found recently. Quote Link to comment Share on other sites More sharing options...
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