The 1000 F (540 C) Walk-In style process ovens are suitable for heat-treating, annealing, hardening and other high-temperature applications. The inner heat chamber is isolated from the outer skin to minimize heat transfer. The heavy-duty doorframe uses a 1 in. (25 mm) nonmetallic heat-break, a thermal expansion joint, and inner and outer gaskets to ensure consistent door seals at high temperature.