Gas Cabinet 2 : Doors, view ports, and control access ports that are incorporated to allow for cylinder change, visual inspection, and access to manual controls
NFPA 318 Standard for the Protection of Semiconductor Fabrication Facilities, 2002 ed. http://www.nfpa.org/assets/files/AboutTheCodes/318 /Errata318-02-2.PDF, (Std: Prot of Semiconductor Fabrication Fcilty - Amer) {297 NFC}