21.21.00 Gas-Based Fire-Extinguishing Systems

21.21.23 Nitrogen-Water Fire-Extinguishing Systems

21.21.13 Carbon-Dioxide Fire-Extinguishing Piping 21.21.13.13 High-Pressure, Carbon-Dioxide Fire-Extinguishing Systems 21.21.13.16 Low-Pressure, Carbon-Dioxide Fire-Extinguishing Systems 21.21.16 Carbon-Dioxide Fire-Extinguishing Equipment 21.21.23 Nitrogen-Water Fire-Extinguishing Systems

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