allen lumley wrote:...your inside diameter of your heat riser is 6". Its Cross Sectional Area , C.S.A., is pi Xs 1/2 diameter squared , 3.14 x (3x3) just under 50 ''
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Dave Burton's Boot Adventures at Wheaton Labs and Basecamphttps://permies.com/t/119676/permaculture-projects/Dave-Burton-Boot-Adventures-Wheaton