glowing stack

[eustis22]

should I worry that my stainless steel (single wall) stack glows at the angle and a jet shoots out the top when the AUF blower is on the owest setting?

[ecolbeck]

A glowing stack is not necessarily a bad thing. Is your rig a 2x3? Shorter evaporators send more flames up the stack which causes the glowing effect. The flames from a hot fire can easily reach 5ft long. Additional flames at the top of the stack occur because there is surplus oxygen available at the flue exit.

[maple flats]

Sort of, the flames at the top are because to oxygen was all consumed before the exhaust got to the top of the stack. There it had 3 things needed for fire- heat, fuel (unburned wood gases) and oxygen, thus it re-ignited. To eliminate that add air over fire. On a 2x3 not likely worth it, but if you grow to a 2x6 or larger it helps a lot with longer intervals between fueling, faster boils and less wood needed.

[eustis22]

Yes, it's a 2X3 arch..I don't think i can do AOF but the stack IS 2' higher than my previous so that makes sense