U.S. Coast Guard-approved marine fire extinguishers are required on boats where the engines or fuel system present a fire hazard.
Fire extinguishers are classified by letter (A, B and C) and number (I and II). The letter denotes the type or types of fire it can extinguish. The most common and least expensive portable extinguishers for boats are class BC dry chemical extinguishers suitable for both flammable liquid and electrical fires.
Easy mnemonic for fire extinguisher types:
Type A Ash, for wood, paper, rubber, plastic or textiles
Type B Boil, for flammable liquids, such as gasoline, oil and grease
Type C Current, for electrical equipment fire
The number denotes how much extinguishing chemical the device holds. According to the U.S. Coast Guard,
Size I extinguishers contain a minimum of 2 pounds of dry chemical
Size II extinguishers contain at least 10 pounds of dry chemical
- Fire extinguishers are required on boats with
- Outboards with closed compartments for fuel tank storage
- Permanently installed fuel tanks
Closed compartments or living spaces
How many extinguishers do I have to carry?
||No fixed system
||Approved fixed system
|< 26 feet
|26 to < 40 feet
||Two B-I or one B-II
|40 to 65 feet
||Three B-I or One B-I and One B-II
||Two B-I or One B-II
You may substitute one B-II extinguisher for two B-Is. Boats with fixed extinguishing systems in the engine room may carry one less B-I. Mount extinguishers in USCG-approved brackets with quick-release catches.