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</o:shapelayout></xml><![endif]--></head><body lang=EN-CA link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='color:#1F497D'>Thanks Tom<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>The interest for me lies in eliminating the chimney. I have a plan….<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>It needs to be made from steel pipe though, not chance for tin on this one: “You know it’s time to replace the metalwork when someone doesn’t wake up in the morning.”<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>Regards<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>Crispin<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>+++++++</span></p><p class=MsoNormal><span lang=EN-US style='color:#1F497D'>Crispin,<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='color:#1F497D'>In concept you are describing what larry Dobson built in the 1970s and called the Grendle. <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='color:#1F497D'>Alternative Sources of Energy Magazine, 1980, The Grendle Report <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='color:#1F497D'> The Mother Earth News Guide to Home Energy, 1980, An Amazingly Efficient Sawdust Stove<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='color:#1F497D'>It was a "hanging grate" furnace with an afterburning chamber for wet bulk fuels like sawdust and hog fuel that would burn efficiently. Heat transfer to the house was through hot gas in roman-style hypocaust ducting. <a href="http://en.wikipedia.org/wiki/Hypocaust">http://en.wikipedia.org/wiki/Hypocaust</a><o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='color:#1F497D'>Grendle was followed by Helen and Gertrude. <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='color:#1F497D'>Since then Larry has built a dozen different designs, some of which can be seen at: <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='color:#1F497D'><a href="http://www.stiltman.com/html/energy_from_waste.htm">http://www.stiltman.com/html/energy_from_waste.htm</a><o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='color:#1F497D'>It seems to me that for stick wood your hybrid cross-draft design would be a useful heat generator for a bench heating system. <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='color:#1F497D'>Tom<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='color:#1F497D'><o:p> </o:p></span></p></div></body></html>