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<div class="moz-cite-prefix">Crispin,<br>
Its been a while since I saw the Vesto. It looks from the pictures
like there are secondary air holes all the way up the central
tube. Is that current?<br>
Seems like the top rows would just be adding tramp air (unemployed
air).<br>
<br>
Alex<br>
<br>
On 20/01/2013 9:42 PM, Crispin Pemberton-Pigott wrote:<br>
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<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Dear
Marc and Ron and All interested in air flows<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">This
is a response to questions about air and Marc’s tube.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Here
is an old photo of secondary air entering the combustion
chamber of a Vesto pushing the flame to the centre. This
accomplishes the following:<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Keeps
the fire away from the wall, reducing the temperature it has
to survive (a lot)<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Keeps
the flame going<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Not
allowing it to spread to one side away from the smoke on the
other side that might otherwise ‘get away’.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Provides
turbulent mixing of flame, hot secondary air and smoke<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Allows
for preheating to a significant degree (250-500 C)<o:p></o:p></span></p>
<br>
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