46 C.F.R. § 76.50-10
Table 76.50-10(a)-Carriage of Portable and Semi-Portable Fire Extinguishers
| Space | Fire extinguishing | |
| Minimum required rating | Quantity and location | |
| Safety Area1 | ||
| Wheelhouse or fire control room | 20-B:C | 1 of each classification on vessels over 1,000 GT. (Not required in both spaces.) (Multiple classifications may be recognized.) |
| Stairway and elevator enclosures | None required. | |
| Communicating corridors | 2-A | 1 in each main corridor in each main vertical zone. (May be located in stairway enclosures.) |
| Lifeboat embarkation and lowering stations | None required. | |
| Radio room | 20-B:C3 | 2 in the vicinity of the exit.2 |
| Accommodations1 | ||
| Staterooms, toilet spaces, isolated pantries, etc | None required. | |
| Offices, lockers, and isolated storerooms | None required. | |
| Public spaces | 2-A | 1 for each 2,500 sq ft or fraction thereof located in vicinity of the exits, except that none are required for spaces under 500 sq ft. |
| Open decks or enclosed promenades | None required. | |
| Service Spaces | ||
| Galleys | 40-B:C | 1 for each 2,500 sq ft or fraction thereof suitable for hazards involved. |
| Main pantries | 2-A | 1 for each 2,500 sq ft or fraction thereof located in the vicinity of the exits. |
| Motion picture booths and film lockers | 10-B:C3 | 1 outside in the vicinity of the exit. |
| Paint and lamp rooms | 40-B | 1 outside space in the vicinity of the exit. |
| Inaccessible baggage, mail, and specie rooms, and storerooms | None required. | |
| Accessible baggage, mail, and specie rooms, and storerooms | 2-A | 1 for each 2,500 sq ft or fraction thereof located in the vicinity of the exits, either inside or outside the spaces. |
| Refrigerated storerooms | 2-A | 1 for each 2,500 sq ft or fraction thereof located in the vicinity of the exits, outside the spaces. |
| Carpenter, valet, photographic, printing shops sales rooms, etc | 2-A | 1 outside the space in the vicinity of the exit. |
| Machinery Spaces | ||
| Coal-fired boilers: Bunker and boiler space | None required. | |
| Oil-fired boilers: Spaces, containing oil fired boilers, either main or auxiliary, or their fuel oil units | 40-B | 2 required.3 |
| 160-B | 1 required.4 | |
| Internal combustion or gas turbine propelling machinery spaces | 40-B | 1 for each 1,000 brake horsepower, but not less than 2 or more than 6. |
| 120-B | 1 required.5 | |
| Electric propulsive motors or generators of open type | 40-B:C | 1 for each propulsion motor or generator unit. |
| Enclosed ventilating systems for motors and generators of electric propelling machinery | None required. | |
| Auxiliary spaces, internal combustion or gas turbine | 40-B | 1 outside the space in the vicinity of the exit.6 |
| Auxiliary spaces, electric emergency motors or generators | 40-B:C | 1 outside the space in the vicinity of the exit.6 |
| Auxiliary spaces, steam | None required. | |
| Trunks to machinery spaces | None required. | |
| Fuel tanks | None required. | |
| Cargo Spaces | ||
| Inaccessible during voyage, including trunks (excluding tanks) | None required. | |
| Accessible during voyage | 2-A | 1 for each 1,200 sq ft or fraction thereof. |
| Vehicular spaces (covered by a sprinkler system) | 40-B | 1, plus 1 for each 6,000 sq ft or fraction thereof. |
| Vehicular spaces (not covered by a sprinkler system) | 40-B | 1, plus 1 for each 1,500 sq ft or fraction thereof.7 |
| Cargo oil tanks | None required. | |
| Spare Units | ||
| 2-A | 10 percent of the required number for public spaces rounded up. | |
| 40-B | 10 percent of the required number for cargo spaces rounded up. | |
| 40-B:C | 1. | |
1 In any case, on vessels of 150 feet (45.72 meters) in length and over, there must be at least two 2-A units on each passenger deck.
2 For vessels on an international voyage, substitute 1 20-B:C in the vicinity of the exit.
3 Vessels of less than 1,000 GT and not on an international voyage require 1.
4 Vessels of less than 1,000 GT and not on an international voyage may substitute 1 160-B.
5 If an oil-burning donkey boiler is fitted in the space, the 160-B previously required for the protection of the boiler room may be substituted. Not required on vessels of less than 300 GT if the fuel has a flashpoint of 110 °F or lower except those on an international voyage.
6 Not required on vessels of less than 300 GT if the fuel has a flashpoint higher than 110 °F.
7 Two 5-B units may be substituted for 1 20-B unit.
The location of the equipment must be to the satisfaction of the Officer in Charge, Marine Inspection. Nothing in this paragraph should be construed as limiting the Officer in Charge, Marine Inspection, from requiring such additional equipment as he or she deems necessary for the proper protection of the vessel.
46 C.F.R. §76.50-10