AK 800/950 °C / HK 1200/1300 °C / AHK 1200/1300 °C AK: Tmax. 800 / 950 °C Chamber furnace for annealing, tempering, hardening and soft annealing under protective gas. Application in hardening shops, pilot plants and laboratories. Air circulation by a ventilator which is integrated in the furnace door for better temperature distribution and heat transfer. Option: 950 °C. HK / AHK: Tmax. 1200 / 1300 °C Chamber furnace with lifting door for annealing, hardening, powder carburization and stress-relieving. Application in hardening shops, pilot plants and laboratories. Option: 1300 °C, lifting door, gas flushing device, loading plate. AHK-Version with a second swivel door and ventilator for annealing and hardening.