allen lumley wrote:Hugo Deslippe : you can run a calculator to do the conversions better than I can- for a 6'' system your cross sectional area should be pi Xs radius squared 3.14 Xs (3 Xs 3)=28''
This is the smallest that your cross sectional area should ever be, and that should be located within the Burn Tunnel !
I Sat on this for a while, looking for other More Likely causes and this is the best I could come up with ! Eventually you must up grade your brick ! Big AL !