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you should. Polyurethane spray foam insulation can be made to withstand the temps of a smoker, but when its used in refrigeration units then its not designed for use in a smoker. Iis hghly recommended you remove it.
Ive called manufacturers in the past and they said it will not work.
Call manufacturer and speak with tech support. I picked up a SS traulsen double door cooler, called tech support gave model/serial # and was told its the same insulation they put in their hot boxes. Which is good to 200*, fine for sausage 160*ish tops.
Every unit is different, worth the call...
Have a coworker who has similar setup and he cooks at 225*- 235* says no issues. He's been doing it for 10+yrs...