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Posted by Bubba on October 31, 2007, 7:33 am
>
>The burners of older natural gas furnaces usually have a round plate
>that can be rotated to either open or closed positions, allowing a
>variable amount of combustion air to enter the burner along with the
>gas.
>
>If the plate is fully open, the resulting flames seem shorter, faster,
>uniform height, and uniform color (blue).
>
>If the plate is fully closed, the flames are longer, slower, variable
>height, and more red in color.
>
>It seems that usually the plates are rotated fully open.
>
>Is it true that back when natural gas was cheap, these intake plates
>are usually set fully open to create a faster-moving combustion flow
>to help increase exhaust temperatures that would help to prevent
>chimney condensation, and that by closing the plates you are
>increasing the efficiency of the furnace by slowing the combustion
>flow and allowing more of the heat to be transfered to the heat
>exchanger instead of escaping out the flue?
You need to purchase a CO meter or combustion efficiency meter and
play with it. You will get all the answers you wish.
Bubba
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