ah, get it. The losses are greater than always heating cold air.
The old style is a truly open system.
Thanks.


On Mon, 19 Feb 2007, Dan Rossi wrote:

> Spero,
>
> Using air from outside of the house to combust in the furnace means that
> you are not taking warm air from inside the house, combusting it, then
> sending it out the exhaust.  Any aire that you remove from the house is
> replaced by cold air from outside the house.
>
> If you combust external air, there is never an exchange of warm air for
> cold inside the living part of the house.
>
> -- 
> Blue skies.
> Dan Rossi
> Carnegie Mellon University.
> E-Mail:       [EMAIL PROTECTED]
> Tel:  (412) 268-9081
>


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