46 CFR §162.028-2
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- (a)Portable and semi-portable extinguishers must be marked with a combined number and letter designation. The letter designates the general class of fire for which the extinguisher is suitable as identified in NFPA 10 (incorporated by reference, see § 162.028-1). The number indicates the relative extinguishing potential of the device as rated by UL 711 (incorporated by reference, see § 162.028-1).
- (b)[Reserved]