Does anyone know what the max temperature of radiant reflective insulation is? It just says Class 1 fire rating. I am making an outdoor wood furnace. I am using roxul insulation in a small metal shed to house it. That has a burn rate of 2,500F. I have a roll of the reflective installation and was thinking of using it in between stove and roxul on face of metal studs. It will be within inches of the stove. Trying to make this as safe and efficient as possible.