Thermal insulation is provided in ceramic fiber and low-density refractory bricks. The heating parts, made up of spiral-wound electric resistors, are placed on the 4 sides of the internal chamber. Cooling is done in natural way. The use of this oven is intended to carry out tests with materials that do not give rise to toxic gases during the thermal phase and that are compatible with the maximum working temperature of the oven itself. In particular, the products to be fired must not consist of dangerous substances due to the emission of irritating substances or substances harmful to human health. The use of flammable or explosive substances must also be avoided.  The oven is designed and built to be installed in environments that do not present a risk of explosion.