CFR 33-149.405-2013 Navigation and navigable waters. Part149:Deepwater ports: design, construction, and equipment. Section149.405:How are fire extinguishers classified?
(a) Portable and semi-portable extinguishers on a manned deepwater port must be classified using the Coast Guard’s marine rating system of a combination letter-and-number symbol in which the letter indicates the type of fire that the extinguisher is designed to extinguish, and the number indicates the relative size of the extinguisher.
CFR 33-149.405-2013 history
2013CFR 33-149.405-2013 Navigation and navigable waters. Part149:Deepwater ports: design, construction, and equipment. Section149.405:How are fire extinguishers classified?