First Signs of Fire
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Smell
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One of the most prevalant and easily-noticed signs of a fire is a smell of smoke or burning materials. As fumes enter the air, they spread through a process known as diffusion. While the smell of a fire may begin as faint or unrecognizable, the smell will continue to grow as more smoke is released (especially in a contained area, such as a house). Smells of gas (as in the event of household leaks) may also precede fires. Treat these smells as threats, and seek help or shelter.
Smoke Detectors
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Even when you can't smell a fire, a smoke detector may still be able to sense it. When properly maintained, smoke detectors work by noting changes to their surroundings, such as smoke and heat. Treat the warning (often a loud beeping noise) as an important sign of when a fire may be close at hand and evacuate your building.
Heat
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While you can't always see the smoke or flames from a fire, you will occasionally feel them. Doorknobs, for instance, may become hot when a room has caught fire. If and when you notice unusual heat from a doorknob, approach the next room with caution.
Unusual Pet Behavior
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Some animal senses, such as a dog's sense of smell, are far more pronounced than those of humans. As such, changes in behavior of pets may indicate an impending problem, such as fire. According to a January 2011 news report in Ann Arbor, Mich., barking dogs were able to rouse their owners from sleep during a fire.
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