The Large Furnace is a robust, industrial-sized structure designed for high-temperature processing. It features a cylindrical metal body with a wide base and a slightly narrower top, capped with a heavy-duty metal lid. The exterior is textured with visible weld lines, rust patches, and heat discoloration, indicating prolonged use. A large, reinforced door with a heavy latch allows access to the interior, where the intense heat is contained. The furnace emits a faint glow from its vents when in operation, suggesting its high thermal output.