Compressed air foam (CAF) is generated by the combination of compressed air, water and foam concentrate in the right proportions, to create a homogeneous foam solution similar to shaving cream. CAF is delivered with high momentum through a fixed piping system, and distributed over the hazard via an approved discharge device. The ICAF compressed air foam system is FM Approved as a local application extinguishing system for class B pool fires, spill fires and cascading fires. Full-scale fire tests have demonstrated ICAF to be an extremely effective extinguishing mechanism for flammable and combustible liquids, both miscible and non-miscible.
The unique physical properties and texture of CAF allow it to form a stable and uniform foam blanket overtop the liquid surface. The robust foam blanket developed during a discharge works at the fuel surface, creating an effective vapour seal to establish a physical separation between the fuel and the burning vapours. Because CAF is generated through aeration in a mixing chamber versus agitation at the nozzle, it has higher expansion ratios and longer drain times than conventional low-expansion foam systems. This translates directly into enhanced extinguishing and burnback performance.