We have safety tips flying at us all the time from every which way, so it can be hard to sort out what’s useful and what isn’t. Listen up readers, because this one is extremely important. When you go to sleep at night, CLOSE YOUR DOOR. It’s that simple. According to the UL Firefighter Safety Research Institute, closing your door at night can mean the difference between life and death in the event of a house fire.

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Research shows that during a house fire, rooms with open doors can reach over 1,000 degrees Fahrenheit. Keeping your door closed can keep your room under 100 degrees during a fire.

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There are other benefits to keeping your door closed: it can limit your carbon monoxide exposure and reduce smoke inhalation. Closed doors also cut off oxygen to a fire and keep it from spreading, so it’s vitally important to take this advice to heart.

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Check out this video from the UL Firefighter Safety Research Institute to see how dramatically different a fire reacts to open and closed doors.

h/t: UL Firefighter Safety Research Institute, Close Your Door