🔍 Key Concepts

• 46 CFR Subchapter H (Passenger Vessels) fire protection requirements • Purpose and location of fire doors in preventing vertical fire spread • How magnetically‑held open doors operate during a fire alarm

💭 Think About

• Ask yourself: Where on a vessel is it most critical to stop smoke and fire from traveling quickly between decks? • Which spaces are normally open for easy movement of people, but must automatically close off during a fire? • Of the choices given, which area most needs a door that can stay open in normal use but close automatically in emergencies?

✅ Before You Answer

• Verify which spaces typically require fire‑resistant, self‑closing, or automatically closing doors under 46 CFR fire protection rules. • Consider where vertical trunking or shafts (like stairways or similar) create a chimney effect for smoke and heat. • Check which areas people pass through frequently enough that a door would often be held open by a magnet for convenience but must shut on loss of power or fire alarm.