I used roxul because of the price but either one will work fine. You can get 1'' ceramic that is rated the same or higher than the roxul and then you can build your outer box smaller and save some steel.
Hello, what is an appropriate size for a ball drain? I am looking at a 3" and found a brass low pressure ball valve for 76 bucks and a 3" pipe for 11 bucks.
What size ball valve would be appropriate for 250gallon smoker? I have read that going too small can cause it to clog up.