Model B371 meets NFPA recommendations for combi and cargo aircraft use. Halon is a "Clean Agent" – a gaseous fire extinguishant that does not leave a residue. Halon is extraordinarily effective in putting out flammable liquid and electrical fires. As a liquefied gas, Halon is able to effectively fight hard-to-reach fires by chemically disrupting combustion. Requires optional bracket NB500 or 809 for use on aircraft.