Because they leave no residue, Amerex clean agent Halon extinguishers are recommended for the most sensitive equipment, including aircraft and automobile engines, and laboratory chemicals and equipment. This Halon extinguisher discharges as a vapor and is used for fighting Class A (wood, paper, cloth), Class B (flammable liquids and gases) and Class C (electronic) fires, causes no cold or static shock, and no impairment of the operator's vision. The brass valve is particularly effective at withstanding harsh conditions. This 9 lb. extinguisher comes with a wall mounting bracket, is fully charged, with the option to include an annual inspection tag.