🔍 Key Concepts

• Look closely at the direction of the arrows in Figure 1 – are they moving mostly across the deck, up and down through decks, or both? • Recall basic shipboard ventilation types used in firefighting: horizontal ventilation (through doors, passageways, ports), vertical ventilation (through hatches, trunks, scuttles), and combination when both are used together. • Think about whether "parallel" describes a standard ventilation pattern you learn in basic shipboard firefighting, or if it’s there as a distractor.

💭 Think About

• Compare Figure 1 with Figure 3: in which figure do you clearly see air or smoke moving straight up through openings between decks? What does that suggest about vertical ventilation? • In Figure 1, trace one complete path of airflow from outside the hull to the exhaust opening. Does that path stay on one deck, move between decks, or do both? How does that relate to the named ventilation types? • Ask yourself: is the airflow in Figure 1 mainly clearing smoke along a passageway on the same level, or is it primarily using a vertical shaft to move products of combustion out?

✅ Before You Answer

• Verify which answer choice best matches what actually appears in the diagram (arrows across vs. arrows up/down). • Confirm from your firefighting notes whether "parallel" is a commonly defined shipboard ventilation method alongside horizontal, vertical, and combination. • Before choosing, be sure you can explain in one sentence: "In Figure 1, the air enters here, moves this way, then exits here," and match that pattern to the named ventilation type.