Small Space Suppression System Electrical Cabinet & CNC Machine Fire Protection The Fike Small Space Suppression System uses a flexible heat-reactive tube which is strategically routed through small applications. The tube is pressurized with nitrogen to activate the connected cylinder of 3M™ Novec™ Fire Protection Fluid to quickly and reliably suppress the fire. 1. A fire melts a hole in the tubing, which is pressurized with nitrogen. 2. Upon release of nitrogen pressure, the valve on the agent container opens. 3. In the direct configuration (electrical cabinets), 3M™ Novec™ Fire Protection Fluid is released directly from the hole in the tubing and directly onto the fire. In the indirect configuration, the agent is released from UL-listed nozzles and into the protected space.