How Fire Alarms Work

What smells can cause a fire alarm to go off? Smoke, obviously, but what about electrical or ozone smells. Will that also cause a smoke alarm to go off?

By N Cole from Granbury, TX

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November 30, 20090 found this helpful

It's not the smell that sets off a smoke detector but the smoke. All smoke detectors consist of two basic parts: a sensor to sense the smoke and a very loud electronic horn to wake people up. Smoke detectors can run off of a 9-volt battery or 120-volt house current.

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November 30, 20090 found this helpful

As foxrun41 said, smoke detectors detect smoke. There are 2 kinds, photoelectric and ionization. One detects smaller particles from fast burning fires and the other is better with larger particles from smoldering fires. The detectors can be set off if something blocks the sensor such as excess dirt or dust or small insects such as spiders.

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