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</o:shapelayout></xml><![endif]--></head><body bgcolor=white lang=EN-CA link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US'>Dear Lanny<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US'>It requires either limiting the primary air supply that drives the evolution of gases while permitting the secondary to reach the gases, or removing some of the fuel.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US'>The use of staged combustion is going to be the most popular with inventers and the removal of fuel is the most popular with current users of open fires.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US'>Where the fuel is dependent on a ‘feed rate’ the feed rate can be changed. That is used in wood pellet furnaces, for example, and LPG cookers – after all, turning the knob changes the fuel feed rate.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US'>Regards<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US'>Crispin<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US'>+++++<o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p><div><p class=MsoNoSpacing style='margin:0mm;margin-bottom:.0001pt'><span lang=EN-US style='font-family:"Calibri","sans-serif"'>Turning down a wood fire</span><span lang=EN-US style='font-size:13.5pt'><o:p></o:p></span></p><p class=MsoNoSpacing style='margin:0mm;margin-bottom:.0001pt'><span lang=EN-US style='font-family:"Calibri","sans-serif"'>How do you limit the reaction without starving the reaction of enough oxygen for clean combustion?<o:p></o:p></span></p><p class=MsoNoSpacing style='margin:0mm;margin-bottom:.0001pt'><span lang=EN-US style='font-family:"Calibri","sans-serif"'>How do you control a wood fire?</span><span lang=EN-US style='font-size:13.5pt'><o:p></o:p></span></p><p class=MsoNoSpacing style='margin:0mm;margin-bottom:.0001pt'><span lang=EN-US style='font-family:"Calibri","sans-serif"'>Lanny Henson</span><span lang=EN-US><o:p></o:p></span></p></div></div></body></html>