Toxic Gas Model Ordinance

The Toxic Gas Model Ordinance requires all Class 1 gases to be contained in a process tube enclosed in a secondary containment tube. Class 1 materials are those with a material hazard index of greater than or equal to 500,000, or that carry a US Department of Transportation classification of Poison A. (Note The Department of Transportation no longer uses the Poison A classification, and there is no direct replacement. Reference Code of Federal Regulations, Title 49, parts 172 and 173 for guidance). 

The codes and regulations governing semiconductor gas facilities include sections of the Uniform Building Code (UBC), sections of the Uniform Fire Code (UFC), the National Electrical Code (NEC), codes of the National Fire Protection Association (NFPA), and various local and state ordinances such as the Toxic Gas Model Ordinance that has been adopted in California. 

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