A wall of a furnace 0.244 m thick is constructed of material having a thermal conductivity of 1.30 / . The wall will be insulated on the outside with a material having an average = 0.346 / , so the heat loss from the furnace will be equal to or less than 1830 /^2. The inner surface temperature is 1588 K and the outer surface is 299 K. Calculate the thickness of insulation required. A: 0.179 .