HalGuard is no ordinary fire extinguisher. It contains an electrically non-conductive"clean" extinguishing agent that rapidly turns into a gas. The clean agent used in HalGuard has passed extensive testing by Underwriters Laboratories, and meets FAA requirements. It can be found on commercial aircraft, and is used by airport fire fighters and on the flight line. Hand held HalGuard extinguishers are available in either compact 1.4 lb. and 2.5 lb. sizes, or larger 5 lb., 11 lb., and 15.5 lb. units. The larger sizes are USCG approved, and meet DOT requirements for the heavy duty truck market. 65 lb., and 150 lb. wheeled HalGuard extinguishers offer maximum clean agent protection for the pit lane or large facilities.