I was clearly wrong. Multiple posts in this forum have noted the foam-like nature of the digital MES insulation
. Bear tried 330F and had insulation failure. Sorry I didn't check into this more.
Most foams are polyurethane based and the working temps are given as 100C/200F max so 275F is pretty sporting for a commercial application (they wisely include a backup thermal switch) and the folks here (thanks tallbm) that have pushed to the requested 325F temp are right at the hairy edge.
I think there are cheaper analog vertical cabinet smokers that are just double-wall air-insulated boxes that would allow some wild west experimentation like I envisioned but a digital MES with a 275F controlled max isn't one of them.
Can't fault Masterbuilt
. Their product works as advertised. Mineral wool would have added an extra $10 to the price and made their employees complain of skin irritation. My vertical Masterbuilt
pellet machine has it (and goes to 350F+) but it retailed for about 2X the price.