I have made some fire with a closed column with dry ice sleeve (not on the level of an actual closed loop, but still solid for what it is)
I had a 3x18.
This is a little smaller, but figured that may be good based on the posts of yours I have read (this is the first thing that came up on google, you can get them other places besides bvv)
I made this with a closed column and fresh frozen that was frozen in a domestic freezer. It’s funny looking back how much I over complicated the process of getting sugar…lol (this was my first run ever)