đ 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
đ 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 extinguishersâdoes 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 fireâwould that be more logically shown by a letter or by a size code?
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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 extinguisherâs class and its size rating.