This is a natural air gravity convection ovens. Uses natural air for drying glassware and samples, sterilization, product age acceleration, evaporation, annealing and polymerizing plastics. Boekel ovens feature a double wall construction, glass wool insulation, aluminum interior and Bi-metallic thermostats. Comes supplied with two adjustable tip-proof zinc plated steel shelves and a spirit filled thermometer. WARNING: Ovens are not to be used to heat combustible materials. 2 year warranty.