A closed door acts as a barrier that slows the movement of heat, flames, and smoke into the bedroom. Tests have shown that rooms behind closed doors can remain significantly cooler and safer than rooms with doors left open.
Smoke can be even more dangerous than flames because it contains toxic gases and can quickly make breathing difficult. Keeping the door closed may preserve cleaner air for longer and provide valuable extra time to wake up and escape.
Closing the bedroom door should be combined with working smoke alarms and a practiced escape plan. It is a simple habit that costs nothing but may create a crucial barrier when every second matters during a fire.
