The unit was 33 inches high by 12 5/8 inches wide and weighed 128 pounds with charge. The shell was constructed from .095-inch brass tubing; the base and top were cast bronze. The 2-inch brass inlet connection required a 1 ½- to 2-inch iron pipe size (IPS) reducer, and the foam discharge hose connection was 1 ½-inch brass national standard thread (NST). The chemicals consisted of aluminum sulfate, bicarbonate of soda and a stabilizing solution which produced a chemical foam blanket composed of water-film globules-filled carbon dioxide.

When in a ready condition, which included a 50-pound Type IV foam charge cartridge that could produce 300 gallons of foam, it could provide a delivery rate of 100 gpm through 75 feet of 1 ½-inch fire hose using a 28-inch trigger control foam nozzle. It operated satisfactorily as long as the inlet pressure was maintained between 50 to 150 psi and the unit was refilled with a new foam charge cartridge every three minutes.

When involved in extended firefighting operations, two personnel were required to operate the unit. With the frequent refills needed, they were kept very busy for the duration.

Ten spare Type IV foam cartridge charges were stowed near the unit for immediate access during firefighting, providing an additional 30 minutes of firefighting agent for the foamaster.