A carbon dioxide (CO₂) fire suppression system is a fixed firefighting installation designed to extinguish fires by reducing the oxygen concentration in an enclosed or semi-enclosed space to a level that cannot support combustion. The system stores CO₂ in high-pressure cylinders or low-pressure refrigerated tanks and releases it through a network of pipes and discharge nozzles when a fire is detected, either automatically via heat, flame, or smoke detectors, or manually through a control panel. Upon activation, the CO₂ rapidly expands and displaces oxygen while also providing a cooling effect, effectively suppressing Class B (flammable liquids) and Class C (electrical) fires without leaving any residue, making it suitable for sensitive equipment like electrical panels, control rooms, and server areas. The system typically includes key components such as storage cylinders, control valves, actuators, discharge piping, nozzles, detection and alarm systems, and safety features like time delays, alarms, and manual abort switches to protect personnel, as CO₂ can be hazardous in occupied spaces. Proper design follows standards such as NFPA guidelines, ensuring adequate concentration, distribution, and discharge time for effective fire control.