At present,the fractionated vacuum is the most advanced and safe system for the elimination of air pockets.Thanks to the different phase of vacuum alternated to the compression phase,the air pockets both in the sterilization chamber and in the hollow and porous tools are expelled and the validity of the sterilization cycle is so guaranteed.On completion of the selected sterilizing program,also,Elaine automatic,pulsed,vacuum assisted drying phase to ensure instruments perfectly dry.