System utilizes a unique flexible tubing that is attached to the cylinder valve assembly. The tube attached is installed within the protected equipment. Upon flame impingement, the tube will melt, releasing the extinguishing agent with the direct system. As for the in-direct system, the tube acts as fire detection device, when it melts and loss pressure, the cylinder valve open and release the extinguishing agent into the protected space via a separate set of pipe network and nozzle. System commonly uses carbon dioxide as extinguishing agent, however, clean agent models are also available.

This system is commonly used for the protection of electrical cabinet and machinery with casing. System models available with FM (Factory Mutual) approval.