Gas Furnace flame color & efficiency
Hi All,
With heating season starting in my area, I was changing the filter. Started
the furnace to check the flame. Flame on all 3 burners are blue for about
1-1.5 inch, but above that they are yellow. Furnace is 20 years old Lenox.
Is there are efficiency problem with the flames as described above?
Thanks,
RichK
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