Lanny,
I understand the comment below but I think flame height can be shortened with excessive excess air. The lowest emissions CO/CO2 and highest temperatures, at some power levels, in appliances that I have tested has often been when there is a significantly taller tail of flame.

However, don't believe  all tall tails :)
Alex

On 14/04/2013 1:51 PM, Lanny Henson wrote:

The combustion air needs to be focused on the combustion zone in a way that shortens the flame height. More like the way a TLUD with a fan works.
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