Larry, When I made my burners (3/4"), I used 3/4" rigid conduit 90 deg. sweeps and your SS flares on the bottom end. They have worked "Reil" well. They will run down to less than 1 psig. I usually use 1 burner and the heat does create a chimney effect up the unused one. I don't see any discoloration so it is not getting too hot. -Rick