•	Phase 1 consists of three parts. The first is a gravity steam portion, whereby steam is introduced into the chamber by gravity, displacing the air in the chamber and preheating the stainless steel shell and waste load. This is followed by a steam pressure period, during which the steam pressure in the vessel is increased to a minimum of 15psig and 250° F. A variable timer maintains this condition for a period sufficient to kill any airborne pathogens (ABP’s) that may be present. Finally, a vacuum is drawn on the vessel to remove any tramp air and prepare for Phase 2. This heating and vacuum regimen is repeated twice for the ‘Red Bag & Sharps’ cycle and three times for the ‘Red Bag & Suction Canisters’ cycle. These repetitions are necessary in order to effectively compromise the waste containers allowing for the effective removal of air and subsequent penetration of steam.
•	Phase 2 begins with the processing chamber under vacuum, into which steam is introduced, filling the chamber and interstitial spaces in the waste. Steam pressure and temperature are maintained at a minimum of 15psig and 250° F respectively for a residence time sufficient to heat and hold the waste at 250° F for sterilization. The chamber pressure being vented to atmosphere signals the end of Phase 2.
•	Phase 3 has been included as part of the cycle to prepare the bins and material to be safely removed from the chamber. It begins with the operation of the vacuum pump, which removes residual moisture from the chamber and the waste. After relieving the vacuum, fresh water sprays on the sides of the bins to cool them for safe removal and eliminate employee related injuries. The cycle ends with a final operation of the vacuum pump to reset the door seal and remove any moisture remaining from the cooling water spray.