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21 20 00 Fire-Extinguishing Systems
21 21 00 Gas-Based Fire-Extinguishing Systems
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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
21 21 00 Gas-Based Fire-Extinguishing Systems
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