8-3/4 x 8-1/8 x 10" 22.2 x 20.6 x 25.4cm. The Electric Furnace kit is a large corrugated-metal building with roof vents and interior furnace detail. Its walls feature cut lines so you can remove portions to match your desired prototype. For more realism, add the Heavy-Duty Overhead Crane, 933-3810, sold separately which is designed to fit the crane rails inside the furnace building.