Apparatus for forming plastic preforms into plastic containers with a transport device which transports the plastic preforms along a predefined transport path, wherein the transport device has a movable station carrier on which a plurality of forming stations are arranged, wherein these forming stations each have blow-moulding devices, each forming cavities within which the plastic preforms can be formed into plastic containers, and the blow-moulding devices are arranged on respective blow-mould carriers, wherein the apparatus has a clean room inside which the plastic preforms can be formed into the plastic containers, isolated from a non-sterile environment by at least one wall. The apparatus has a change device which is suitable and intended for at least removing the blow-moulding devices from their blow-mould carriers and/or arranging blow-moulding devices on the blow-mould carriers, wherein this change device is integrated in a module which can be separated from the clean room.