Which firefighting system displaces oxygen from a space?

The Halon (FM-200) system is specifically designed to suppress fires by displacing oxygen from a space as part of its fire extinguishing process. Halon is a halocarbon gas that interrupts the chemical reaction of combustion, effectively suffocating the fire without the cooling effect that water-based systems provide. Since fires need oxygen to sustain combustion, lowering the oxygen level can extinguish the flames, making Halon a highly effective suppression agent in environments where traditional methods may not be viable, such as data centers and aircraft.

In contrast, the wet pipe and dry pipe systems utilize water to extinguish fires, relying on the cooling effect and the physical barrier water creates. The deluge system is designed to release a large amount of water to quickly soak an area and extinguish flames, also relying on water rather than oxygen displacement. Therefore, these systems do not displace oxygen but instead combat fire with water as the primary extinguishing medium. This distinction makes the Halon (FM-200) system the correct choice for a system that works by displacing oxygen.