Leadership

New Extinguisher Classification

Issue 12 and Volume 109.

New Extinguisher Classification The National Fire Protection Association has adopted a new system of fire extinguisher classification. Designed to give a better indication of extinguisher capabilities, the system is outlined in the 1956 edition of Pamphlet No. 10 which contains major revisions of the 1955 Standard. Based upon the classification of fire and the extinguishment potential, it consists of a numeral and a letter, and appears on the approval label of the device. For Class “A” appliances, the numeral is indicative of the approximate relative fire extinguishing potential of the various size Class “A” devices, i.e., a 4-A appliance can be expected to extinguish apj proximately twice as much fire as a 2-A appliance. In the case of Class “B” appliances, the numeral is indicative of the approximate relative extinguishment potential and in addition, the numeral is an approximate indication of the square-foot area of deeplayer flammable liquid fire which…

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