-=> Jay Emrie said to Mike Ross
 -=> about "FURNACE FAN?" on 12-27-02  09:48.....

 JE> Condensation definitely was a problem with the older gas
 JE> furnaces which used a constantly lit gas flame pilot light.
 JE> For quite a number of years now the furnaces use an
 JE> electronic spark pilot light thus a very minimum of
 JE> condensation.

But you'd still get condensation if the flue temperature dropped
too low, for example if you increased the efficiency of the
system to extract more heat from the combustion gases before they
were vented off.

It's just that burning a lot of gas usually keeps the flue temp
above the condensation temperature.

From Greg Mayman, in beautiful Adelaide, South Australia

... I will defend to the death your right to my opinion!
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