21 21 00 Gas-Based Fire-Extinguishing Systems

21 21 13 Carbon-Dioxide Fire-Extinguishing Piping

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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