Sam Salvati Posted October 25, 2007 Share Posted October 25, 2007 WIll this work? From foor to top of the roof is 16 feet. the chinney will go up the wall about 6 or 8 feet off the top of the forge table, then elbow out the wall then elbow up again and go to 4 feet above roofline. Stovepipe is 10 inch single wall. the opening in the chimney for the side draft is less than the area of the ID of the pipe. Quote Link to comment Share on other sites More sharing options...
MLMartin Posted October 26, 2007 Share Posted October 26, 2007 alot of people say not to put elbows in, lessons the draft, you can get away with them but try doing it on an angle if you can, so its not a straight 90 turn, im about to bild a side draft hood for mine Quote Link to comment Share on other sites More sharing options...
Glenn Posted October 26, 2007 Share Posted October 26, 2007 Search the archives for Chimney Size and Height or click here for a way to calculate what you need. Quote Link to comment Share on other sites More sharing options...
Frosty Posted October 26, 2007 Share Posted October 26, 2007 It'll work, not as well as a straight pipe but it'll be okay. Put the elbow as high as possible while maintaining a safe distance from the ceiling. Outside use one of the flap vented "T" fittings rather than the elbow. They're designed to keep cold air from backdrafting down your chimney. It's similar to a smoke shelf in effect and function. Frosty Quote Link to comment Share on other sites More sharing options...
Jymm Hoffman Posted October 26, 2007 Share Posted October 26, 2007 Way back when I still burned coal, I had to do the dog leg thing out the side since the land lord didn't want a hole in the roof. It worked very well. Even with it at a slight angle, it still collected soot and ash that needed attention every once in a while. You might also try running straight through the wall at the height of the forge (start your side draft there.) This is a trend I have seen to help get the chimney outside as soon as possible, especially for schools that operate in hot weather. You basically run the chimney to the ground outside the building and tee into it. It should be easier to clean out than trying the horizontal run up higher, especially if you put a an access door on the outside below the T. Quote Link to comment Share on other sites More sharing options...
Feukair Posted October 27, 2007 Share Posted October 27, 2007 Mine makes a 90 turn right out of the hood to go outside, then another 90, it draws good once it gets hot. I light a few wads of news paper in it to heat it up just as i'm about to light the coal to help get it going. I know it doesnt draw as fast as some of the straight up ones that i've seen, but its good enought for me. Lt Quote Link to comment Share on other sites More sharing options...
Sam Salvati Posted October 27, 2007 Author Share Posted October 27, 2007 Thanks guys! I'll build it and see how it works. Jymm i like that idea i remember seeing a picture of Hofi's school with hoods like that, going right out to the chimney and up. might be worth a try. Quote Link to comment Share on other sites More sharing options...
Jacob Posted October 29, 2007 Share Posted October 29, 2007 I'm building one this way. My wall is cinderblock for the bottom half, and wood for the top. I'm sending it through a knocked out block so that I don't have to isolate heat from the wood. I have a taller roof, and I'm using 12" diameter pipe. The larger diameter should help get around the corners a bit. 12" was strongly recommended to me, so you might try that if you havn't purchased materials, yet. There are some things you can play with if you want a different performance. Insulating the outdoor chimney would help keep it warm, insulating it inside would keep the shop cooler. Different caps will also impact the draft. I'm going to try the low loss design shown on anvilfire. Quote Link to comment Share on other sites More sharing options...
Glenn Posted October 29, 2007 Share Posted October 29, 2007 BP0460 Anatomy of a Forge Flue Quote Link to comment Share on other sites More sharing options...
Ten Hammers Posted October 30, 2007 Share Posted October 30, 2007 Jymm brings up a good point. Many woodstoves have chimneys built outside and just tee the stove out the wall. works well. Quote Link to comment Share on other sites More sharing options...
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