🔍 Key Concepts
• Fire extinguisher classification system (Class A vs. Class B and the meaning of the Roman numerals I, II, V, etc.)
• How specific extinguisher sizes and agents (foam, CO₂, dry chemical, soda acid) map into B-II, A-II, and B-V ratings
• The difference between quantity of units and rating equivalence (one large unit may cover several smaller ratings)
💭 Think About
• First, recall what the letters (A, B) and Roman numerals (I, II, V) actually represent in Coast Guard terms for portable extinguishers.
• For each choice, match the type and size of each extinguisher listed to its Coast Guard rating (e.g., which ones are B-II, which are A-II, which could be B-V, etc.).
• Then check whether any of the larger units in the options can satisfy more than one of the required ratings or replace multiple smaller units.
✅ Before You Answer
• Verify which extinguisher types and sizes are accepted as B-II, which as A-II, and which can qualify as B-V under current USCG tables (46 CFR, Subchapter T/L as applicable).
• Confirm that the total number of units by rating (how many B-II equivalents, how many A-II equivalents, and at least one B-V equivalent) meets or exceeds the COI requirement.
• Make sure you are not just counting physical extinguishers; focus on their rating equivalency, because a single large unit may satisfy the B-V requirement and also more than one B-II.