Specifies requirements for fully automatic jacketed pre-vacuum steam sterilizers, which operate at a sterilizing temperature of 134 degrees Celsius and are intended for use in hospitals and other non-industrial applications for the sterilization of porous loads, and instruments and utensils wrapped in porous material. The sterilizers are not intended for the sterilization of fluids, or for installation in areas associated with the use of flammable anaesthetics. Guidance on information to be supplied with enquiries and orders, guidance on installation, methods of test, and information on quality of water are given in appendices.