SS fridge to smoker

[mkmartin0615]

I know this question has been asked but cannot get a clear response. I have a 2018 argus fridge that im converting to a pellet smoker. They used high density polyurethane foam. Its 2inch cfc free polyurethane foamed insulation. Should I tear it out and replace with rockwool? Or leave it and start building. It will be used for sausage.

 

[SmokinEdge]

No plastic and no foam if temps are above 100*