key damper

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I have 27 feet straight up after a short horizontal run and one 90 degree bend - one key damper works fine with a catalytic stove as the catalytic combustor tends to slow the draft down as well. With my previous tube stove, one key damper hardly did a thing.
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if you look at the stove when it's dialed in, nice slow blue ghost flames but burns down fast compared to what i read on forum.
My previous Lopi tube stove would burn hot (stove top temperature 700-750 degrees) and fast, but good tube-driven gas burning. I could slow it down a little at the startup with the key damper closed almost all the way, but once it got going there was no way to slow it down. My new catalytic Woodstock stove tames the draft very well with one key damper.