Available in 5 lb. (DDPAX355+), 9 lb. (DDPAX369), 13 lb. (DDPAX371), and 17 lb. (DDPAX316) sizes. Zero-residue Halon extinguishing agent for Class B and C fires  Includes wall mounting bracket UL rating: 10B:C Stored pressure design Rugged steel cylinder with corrosion-resistant polyester paint All-metal chrome-plated brass valve  HALON 1211 is a liquified gas, pressurized with nitrogen, which discharges as a vapor causing no cold or static shock and no impairment of the operator's vision. This "CLEAN" agent quickly penetrates difficult-to-see and hard-to-reach areas and leaves no residue. It is recommended for the protection of delicate, sensitive, and expensive computers, electrical equipment, tapes and film, automotive and aircraft engines, laboratory chemicals, and equipment.