These vehicles have been fitted by Moore Engineering with a compressed air foam system. In addition to the main water pump, there are two basic sub-systems that comprise the compressed air foam system. The first is the addition of a foam concentrate proportioner to inject foam into the water in the pump. The second is the addition of an air compressor system to supply compressed air for foam making.
Operation of the system with only the foam concentrate proportioner will result in the apparatus functioning as a conventional foam-equipped unit. Operation of the unit with the foam proportioner and air compressor engaged will result in the unit being capable of creating compressed air foams.