Did you know that keeping a door closed in a fire can slow the spread of fire, reduce toxic smoke levels and keep temperatures significantly lower? Keeping doors closed can give a person more time to escape the fire and smoke. For those reasons, the Seattle Fire Department recommends installing smoke alarms inside bedrooms and keeping the door to bedrooms closed while sleeping.
If a fire starts in your home, close the door behind you as you exit the room to contain the fire to one area. This is especially important in apartment buildings. Closing the door to the hallways and keeping stairwell doors closed prevents the spread of smoke and fire.
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Home fire evacuation handout from the Seattle Fire Department