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.

Gas FM-200 is stored as a liquid in pressurised cylinders at 25/42/50 bar at 21°C. Each cylinder at the outlet has an associated valve which is furnished with: a manometer, burst disk, pressure switch (intended to control the pressure in the cylinder), manual actuator and electromagnetic actuator.

In the event of a fire, the system fire alarm signals the fire and activates the electromagnetic actuator which opens the valve on the cylinder containing FM-200 gas. When the system is activated, FM-200 gas evaporates at the spray nozzles and suppresses the fire in the form of gas.

Due to decomposition of the gas at high temperatures developing in a fire, the time of discharge of the gas is a maximum of 10 seconds at 20°C.

The minimum hold time of the required concentration of the gas in the protected zone in compliance with the standards should be 10 min. This period of time is checked using the door fan test.

During discharge in the protected zone, first a negative pressure occurs (due to a slight cooling of the room), followed by overpressure. In order to ensure the integrity of the protected zone, it is essential to ensure pressure compensation, i.e. to secure the protected zone from damage which could occur in the fire extinguishing process.