🔍 Key Concepts

• Class A fire behavior (ordinary combustibles like wood, paper, textiles) • Effect of straight stream vs. fog stream in a confined space • Dangers of introducing too much air/steam into a closed compartment fire

💭 Think About

• In a closed compartment, what is your first priority when you barely crack the door—knock down visible flames, cool the compartment, or search for the exact seat of the fire? • How does a fog pattern behave in an enclosed space compared to a straight stream in terms of heat absorption and steam production? • Which pattern and technique will most quickly reduce temperature and improve safety before advancing further into the space?

✅ Before You Answer

• Identify how a fog stream vs. a straight stream affects heat, smoke, and visibility in a closed room. • Consider what happens if you create a lot of steam at human height in a confined area where firefighters might need to enter. • Verify standard maritime firefighting guidance for initial attack on a large Class A fire in a closed compartment and preferred nozzle pattern on entry.