The main categorisation of these systems is to:

1. Carbon dioxide high pressure systems
These systems consist of a line with spray nozzles, a cylinder with associated valve and the control unit of the electronic part of the system.

Carbon dioxide is stored as a liquid in cylinders pressurised to 50 bar. In the case of a fire, the system fire alarm signals the fire and activates the electromagnetic actuator on the pilot cylinder which opens the valve on the cylinder. The remaining cylinders required for extinguishing a fire in the protected zone are activated by means of a pneumatic actuator.

2. Carbon dioxide low pressure systems
These systems consist of a line with spray nozzles, a cylinder with associated valve and the control unit of the electronic part of the system.

Carbon dioxide is stored as liquid in the cylinder which is cooled and maintained at a constant pressure of 21 bar @ -18°C. In the case of a fire, the system fire alarm signals the fire and activates the electromagnetic actuator on the selector valve which releases CO2 into the protected zone.

During fire extinguishing a negative pressure occurs in the protected zone. In order to ensure the integrity of the protected zone, it is essential to ensure the compensation of pressures, i.e. to secure the protected zone from damage which could occur in the fire extinguishing process.