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re: question about combustion air input on a high efficienct furnace.
11 nov 2005
stretch wrote:
>the air in the house was heated at 90 percent efficiency (by the
>furnace heat exchanger) before it is sucked into the combustion chamber to
>burn. if you draw outside air directly into the combustion chamber,
>it is heated at 100 percent efficiency (no losses in the heat exchanger).
good point. there's a real energy savings, although it is small.
>sealed combustion also reduces standby losses that would otherwise go
>up a chimney...
an automatic flue vent might do that better.
nick
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