This Amerex clean agent carbon dioxide, wheeled fire extinguisher covers your large-scale fire protection needs. It is a logical choice where a Class B (flammable liquids and gases) and Class C (electrical) fires require a non-contaminating agent and where hand portable extinguishers do not provide adequate protection. Carbon dioxide is a clean, non-contaminating odorless gas which discharges as a white cloud of "snow," smothering the fire by eliminating oxygen. This 100 lb. (2 - 50 lb. cylinders) CO2 wheeled unit has 16-inch pneumatic wheels, is fully charged, and includes the option for an annual inspection tag.