Fire Extinguishers All mechanically propelled vessels, except outboards less than 26 feet in length and of open construction, must carry one B-I US Coast Guard approved fire extinguisher. Mechanically propelled vessels 26 feet to less than 40 feet in length must carry two B-I US Coast Guard approved fire extinguishers. Mechanically propelled vessels 40 feet to less than 65 feet in length must carry three B-I US Coast Guard approved fire extinguishers. Vessels 65 feet and greater in length should consult federal regulations. On any vessel, one B-II extinguisher may substitute for two B-I extinguishers. Vessels equipped with approved fixed extinguishing systems may carry one less B-I extinguisher. Beyond the previously mentioned requirements fire extinguishers are also required whenever: a vessel is equipped with an inboard engine, where there are enclosed or permanently mounted fuel tanks on board, when there are enclosed living spaces, or there are closed stowage compartments in which combustible or flammable materials are stored. The most common types of fire extinguishers are dry chemical and carbon dioxide. Dry chemical extinguishers are for use on fires caused by flammable liquids such as fuel or grease Minimum number of hand portable fire extinguishers required Vessel Length No Fixed System With Approved Fixed Systems Less than 26" 1 B-1 O 26' to less than 40' 2 B-1 or 1 B-ll 1 B-l 40' to 65' 3 B-l or 1 B-ll & 1 B-1 2 B-1 or 1 B-ll 24