The 15 LB Halotron I Stored Pressure Fire Extinguisher is a “clean agent” fire extinguisher, meaning it is residue-free. It is also earth-friendly. Extremely low in both ozone depletion and global warming potential , this extinguisher is an excellent replacement for halon 1211 extinguishers. Ideal for use on computers, telephone switch rooms, electronic data storage equipment, basically anywhere you have sensitive electronic equipment