I got this Foster blast chiller it is stainless steel inside and out I was worried about the insolation inside so I phoned the company they told me the insolation is ridged board polyurothain and if no open flame was touching it I should be good for temps. To 300 to 350 F. There is no insolation showing on the inside it is all sandwiched between the stainless do I need to worry about it leaching or should I be able to go ahead with this build? Any help would be great thanks.