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Posted to alt.home.repair
a a is offline
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Default Old FHA system...

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