1.1 This specification covers forced-convection ventilated electrically-heated ovens, operating over all or part of the temperature range from 20C above the ambient temperature to 500C, and used for thermal endurance evaluation of electrical insulating This specification covers forced-convection ventilated electrically-heated ovens and used for thermal endurance evaluation of electrical insulating materials. The ovens shall be classified according to ventilations: Type I and Type II. Rate of ventilat