In my prototype build the heat riser is firebrick, there is overhang to get the correct dimension (5.5 x 5.5). The diagonal distance of the furthest corners is 17". The ID of the barrel is 22", which leaves 5" BUT
I still need to add in my 1" refractory blanket, plus the mesh to hold it on. That is going to be a tight fit. Is this normal? I have read about proper distance of barrel at top of heat riser, but not at the sides.
If it is too tight, does that mean I need to trim ALL of the bricks??