an apparatus for shaping plastic preforms into plastic containers may include a conveying device on which a plurality of blowing stations are arranged . each of the blowing stations encompasses a blow mold , within which a plastic preform can be shaped into a plastic container . the apparatus further includes a clean chamber , within which the plastic preforms can be conveyed . the zone of the conveying device in which the blowing stations are arranged is located in the clean chamber , and at least one additional zone of the conveying device is located outside the clean chamber .