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I think the 30cm rule is based upon when you open the door to replenish the firewood, you have the potential for embers to escape.
I also seem to remember from the Navitron forum that two 45degree bends, with one as soon as possible out the back of the Hobbit SE, gives a better draw than one, more distant 90 degree bend.
mespilus
stevo_com
Aye, the Hobbit SE is for smoke-free so would go for that. I read the 12 inch rule too but I think that is for open fires, chances are I'd want it 12" out from the wall/breast anyway.