RE: Furnace problem

["Randall Young" <Ryoung@navcomtech.com>]

> Next I took off the exhaust blower, shook
> out the rust,
> and saw that the squirrel cage fan that boosts the exhaust gas
> had corroded
> apart.  And the furnace is only three years old.

Such failures seem to be common with high efficiency furnaces, mostly I
suspect because the exhaust is so cool that the flue gases condense into
acid that corrodes metal.  Check your heat exchanger carefully, as even
pinhole leaks can result in carbon monoxide getting into your living
quarters.

Randall