[9 LIVES]

My 6" stove pipe comes off the top of the top barrel and goes up maybe 2' then 90* goes towards the shop wall to exit the wall which is a 4' run of 6" pipe.

Once it exits the shop wall to the outside its another 1' piece before it has another 90* bend to go upwards. 4' vertical section to a rain cap.

Someone once told me I need to go higher up then 2' off the top barrel before I go 90* towards the wall but they never mentioned how far " Up "