Box-type chamber furnaces are suited for use in nearly all types of thermal processing and heat treating applications. A pair of twin box furnaces will be used to process turbine parts for a manufacturer of power generation turbines. Each of the furnaces is equipped with multiple heavy-duty cast-plate heaters with heavy-gauge wire-wound elements totaling 130 KW of power. The vertical lift doors are opened and closed using dual synchronized pneumatic cylinders. Temperature controls include a single-zone controller with integrated digital chart recorder/data acquisition and an independent overtemperature controller, both reading Type K thermocouples. Power is controlled by zero-cross SCR power controllers in a three-phase configuration and monitored by one ammeter per phase.