Structure in electrolytically galvanized sheet steel with high resistance epoxy powder coating. Internal chamber in smooth AISI 0 stainless steel, with rounded edges to avoid contamination, without any surface discontinuity. Any internal parts are removable without the need for tools for maximum cleanliness. Internal door in glass with silicone rubber sealing. Exclusive KW system for controlled heating and ventilation of the internal door in glass sheet: eliminates condensation, ensuring quick temperature recovery after opening the door.