This part of 60216 covers the minimum requirements for ventilated and heated multi-chamber ovens used for thermal endurance evaluation of electrical insulation and of any other appropriate thermal conditioning application where the use of single-chamber ovens is inappropriate. It covers ovens designed to operate over all or part of the temperature range from 20 K above ambient to 500 °C. It gives acceptance tests and in-service monitoring tests for both unloaded and loaded multi-chamber ovens and conditions of use.