Stack-melt zone of the industrial furnace consists of a sloped charging stack that helps to minimize impact damage from ingot or large, heavy scrap. Instead of falling directly onto the impact zone, it slides and tumbles to the bottom of the charging stack. At the intersection of the stack and hearth, the metal begins to melt. Additional material that is charged in the stack is preheated until the metal below it becomes molten and runs off the hearth through the flanged connector into the separate customer-supplied melting and holding furnace. A laser charge stack level control monitors material level in the stack for maximum efficiency. The two manually operated doors on adjacent sides allow for easy access to the melting chamber for cleaning.