In the event of a fire, the doors to a stair tower must be closed to prevent the spread of fire by which method?
• Heat transfer methods in a fire (conduction, convection, radiation) • How hot gases and smoke move through a ship’s interior spaces • The role of stair towers and doors in vertical fire spread
• Think about which method of heat transfer involves movement of hot gases or smoke through openings like doors and stairways. • Ask yourself: a stair tower is basically a vertical shaft—how does fire or heat most easily travel upward through such a space? • Consider which method of heat transfer doors can physically block just by being shut, versus what can still pass through a closed door.
• Identify which heat transfer method depends on air or fluid movement rather than direct contact or line-of-sight heating. • Decide which method is most responsible for carrying smoke and hot gases up stairwells on ships and in buildings. • Verify that the option you choose is something that a closed door can effectively limit or interrupt in a stair tower.
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