Invention on Instagram: "Firefighters often use small training dollhouses to demonstrate how fire behaves inside a structure. These models allow instructors to show how heat and smoke move through rooms and hallways and how even small changes in airflow can dramatically alter fire growth. What looks like a simple model represents the same principles at work in a full sized building. One of the most important lessons is door control. When a door or window is opened it can introduce fresh oxygen t

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