The UL listed thermo sensitive tube is the lifeline of the whole system and act as the responder for any fire/temperature rise in the enclosure. Fire Detection Tubing (FDT) is installed throughout the electrical cabinet.

When a fire break out, the point on the pressurized FDT nearest the heat source will burst, allowing the fire suppression agent to flow from the extinguishing agent cylinder through the tubing, and out of the rupture hole which forms nozzle and extinguishes directly at the source of the fire. The result is a long discharge of agent in the immediate vicinity of the fire, suppressing the fire where it starts. Direct Low pressure Systems can also be used in cable runs and trays.