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We have built a outside building with a wood burner.
we build a box with a fan in it and ran a 4" corregated pipe underground but it is not getting the heat into the other building it is cool. My question is how do we insulate the undergroung pipe. Our outside building is so hot I can't stand wasting all the heat. HELP
The only insulation I know of that would work is the flexible foam underlayment for vinyl siding. You'd have to wrap it maybe 3X around to get any insulating value.