BISMARCK, N.D. - A new campaign for fire prevention started this week called Close Before You Doze.
This experiment by Underwriters Laboratories shows a room with a closed door and one with an open door. A fire is started in the living room, and the damage speaks for itself.
"It's a barrier to smoke, it's a barrier to heat, and it can create an area of refuge for someone who might be trapped in a room," said Owen Fitzsimmons, fire marshal.
Fitzsimmons says there's a 900 degree difference on either side of a closed door.