🔍 Key Concepts
• Uninspected vessel fire extinguisher markings (letters vs Roman numerals)
• Fire classifications (A, B, C, etc.) and what they represent
• Difference between type/size and intended use of extinguishers
💭 Think About
• Ask yourself: on a fire extinguisher label, what do the LETTERS (A, B, C) normally indicate, and what do the NUMBERS or Roman numerals (I, II, III) usually indicate?
• Think about what changes physically when you go from I to II to III on extinguishers—does that usually affect nozzle size, applicator size, or overall capacity?
• Consider how the Coast Guard wants operators to quickly know whether an extinguisher is suitable for a particular kind of fire—would that be more logically shown by a letter or by a size code?
✅ Before You Answer
• Verify in the uninspected vessel regulations that letters (A, B, C) are associated with a specific type of fire hazard.
• Confirm that Roman numerals (I, II, III) in the regulations are used to indicate size/capacity category rather than nozzle or applicator dimensions.
• Before picking an answer, be sure you can explain in your own words the difference between an extinguisher’s class and its size rating.