A61332 / 332 FIRE EXTINGUISHER 20 LB C02 Amerex® Fire Extinguishers Stored pressure dry chemical fire extinguishers for use on ordinary combustibles, flammable liquids and gases and energized electrical equipment. Features all metal valves and includes wall mount brackets. CO2 Fire Extinguishers are for use on flammable liquids and energized electrical equipment. They operate effectively in a temperature range of -40 to +120° F, with a discharge range of three to eight feet.