Hello Everyone,
I plan to use fire brick to construct my entire J tube. I was wondering about the round vs square riser, inside as well as outside of said riser. I am using the fire brick for ease of construction, and durability, but have some question on efficient combustion.
1 Should I forego on the fire brick riser altogether, and use a cast tunnel made from vermiculite/fire mortar?
2 Does a square fire brick riser work best if the outside of it is "rounded" with vermiculite/ fire mortar?
3 Does a square fire brick mortar work best if the -inside- of it is also rounded " " / " " ?
4 Or, am I overthinking that part of it?
