The QDH Series Dual Chamber Heat Treating furnaces feature a 2350°F (1285°C) high heat chamber for hardening and a 1875°F (1025°C) recirculating chamber for preheating and/or tempering. The over/under configuration saves floor space. The tempering/preheat furnace is mounted on top with the high heat hardening furnace mounted below. Agitated and heated quench tanks are optional. The furnaces achieve high precision by featuring highly accurate controls, solid state contactors for fast cycle times, two zone control (top and bottom) on the hardening furnace, and very even spacing of elements. The preheat/tempering chamber features a powerful fan and recirculation muffle for high uniformity.