An apparatus (1) for shaping plastic preforms (10) into plastic containers (2) is disclosed. Said apparatus (1) comprises a conveying device (2) on which a plurality of blowing stations (8) are arranged. Each of said blowing stations (8) encompasses a blow mold, within which a plastic preform (10) can be shaped into a plastic container (20). The apparatus (1) further comprises a clean chamber (6), within which the plastic preforms (10) can be conveyed. According to the invention, the zone of the conveying device (2) in which the blowing stations are arranged is located in the clean chamber (6), and at least one additional zone of the conveying device (2) is located outside the clean chamber (6).