A rectangular box with inside dimensions of 4 feet by 4 feet by 3 feet. With a 10 inches thickness of fireclay brick with a thermal conductivity that depends on temperature: = 5.71 10^2 + 2.44 10^3 9.4 10^7 ^2, where the units of k are W/mK. The inside temperature of the oven is 950C. The temperature outside the oven wall is 37C. What is the steady-state heat transfer out of the oven?