If your boat is less than 26 feet, you need one 5-B fire extinguisher on board. 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 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.
What Size Fire Extinguisher For Boat – BoatProClub.com
Yet one might not be sufficient for larger vessels. These boats, between 26 and 40-feet long, require at least two. This requirement, however, can be modified to one if the craft has a built-in, USCG-certified fire quenching system for the engine compartment.
The length also indicates what type of fire extinguisher you need. Less than 26 feet: 1 B1 extinguisher; Between 26 and 40 feet: two B1 or a B2; Between 40 and 65 feet: three B1 or two B2; If you have a vessel longer than 65 feet, you should check applicable federal regulations for the required type of fire extinguisher.
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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