参考ISPE CNC:controlled not classified 受控但未分级区
An area without airborne particle limits, but with filtered ventilation.
A non-classified room environment where closed processes and their immediate support systems may be located. CNC space is cleanable, access controlled and served with filtered ventilation air; procedural controls and personnel garment upgrades may be applied at the Owner’s discretion. In the biopharmaceutical industry CNC is replacing the term “Gray Space”.