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Nate Nagel Nate Nagel is offline
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Default Old FHA system...

a wrote:
Replaced the filter after doing some renos and noticed that the exhaust
(flue?) that runs through the cold air return portion (and thus heating
it) is just regular round pipe. It occurs to me that it would be *much*
more efficient if there were thin metal vanes epoxied/welded to the
outside and thus giving a much larger surface area for the exchange of
heat.

Are there such vanes? Can't I just make them myself?

a


You could shove in a flue from an old water heater, if it isn't too small...

nate

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