If your boat is between 26 and 40 feet, you need either two 5-B fire extinguishers or a single 20-B fire extinguisher. And finally, if your boat is between 40 and 65 feet, you need either three 5-B fire extinguishers or one 20-B fire extinguisher and one 5-B fire extinguisher. If your boat is longer than 65 feet, check the federal regulations.
Boats less than 26′ have to have at least one B-1 fire extinguisher on board. Boats 26′-40′ need to have at least two B-1 fire extinguishers on board. If the boat has a USCG approved fire extinguisher system installed for protection of the engine compartment, then the required number may be reduced.
Fire Extinguishers : BoatUS Foundation
or One 20-B. If you own a boat that is model year 2018 or newer, you may need to replace your fire extinguishers. In addition to meeting the carriage requirements for the correct number of extinguishers for the size of your boat, they must be labeled as 5-B, 10-B or 20-B, extinguishers labeled with B-I or B-II only are no longer acceptable.
21A/144B. The number of extinguishers may be reduced by one 5A/34B fire extinguisher if there are no cooking, heating, refrigerating, lighting or fuel-burning appliances on the boat, or if the boat doesn’t have an engine.
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Buyer's Guide to Marine Fire Extinguishers Video Answer
Reference:
https://www.usfa.fema.gov/
https://en.wikipedia.org/wiki/Fire_extinguisher